The required answer is sec θ = -√2.
Explanation:-
Part 1: Given cosine of theta is equal to radical 3 over 2 on the domain [0,[infinity]).
To determine three possible angles θ, the cosine inverse function which is a cos and since cosine function is positive in the first and second quadrant. Therefore conclude that, cosine function of θ = radical 3 over 2 implies that θ could be 30 degrees or 330 degrees or 390 degrees. So, θ = {30, 330, 390}.Part 2:To convert 495° to radians, multiply by π/180°.495° * π/180° = 11π/4To find sec θ, we use the reciprocal of the cosine function which is sec.
Therefore, sec θ = 1/cos θ.To find cos 11π/4, the reference angle, which is 3π/4. Cosine is negative in the third quadrant so the final result is sec θ = -√2.
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he second quartile for the numbers: 231,423,521.139347,400,345 is A 231 B. 347 C330 D. 423 47. Which of the following measures of variability is dependent on every value in a Set of dista? A Range B. Standard deviation CA and B D. Neither A nor B 48. Which one of these statistics is unaffected by outliers A Mean B. Interquartile range C. Standard deviation D. Range 49. Which of the following statements about the mean is not true? A It is more affected by extreme values than the median B. It is a measure of central tendency C. It is equal to the median in skewed distributions D. It is equal to the median in symmetric distributions 50. In statistics, a population consists of: A. All people living in a country B. All People living in the are under study All subjects or objects whose characteristics are being studied D. None of the above 51. The shape of a distribution is given by the A Mean B. First quartie Skewness D. Variance 52. In a five-number summary, the not included: A. Median B. Third quartile C. Mean D. Minimum 53. If a particular set of data is approximately normally distributed, approximately A. 50% of the observations would fall between standard deviation around the mcan B. 68% of observations would fall between 1.28 standard deviations around the mean C95% of observations would fall between 2 standard deviations around the mean D. All of the above 54. Which of the following is an appropriate null hypothesis? A. The difference between the means of two populations is equal to 0. B. The difference between the means of two populations is not equal to 0. C. The difference between the means of two populations is less than 0. D. The difference between the means of two populations is greater than 0. 55. Students took a sample examination on the first day of classes and then re-took the examination at the end of the course: Such sample data would be considered: A. Independent data B. Dependent data. C. Not large enough data D. None of the above 56. If the p-value is less than alpha (c) in a two- tail test: A. The null hypothesis should not be rejected B. The null hypothesis should be rejected. C. A one-tail test should be used. D. No conclusion can be reached.
D. 423, C. Range, B. Interquartile range, C. It is equal to the median in skewed distributions, C. All subjects or objects whose characteristics are being studied, B. Skewness, C. Mean, D. All of the above, A. The difference between the means of two populations is equal to 0, B. Dependent data, B. The null hypothesis should be rejected.
What are the five values included in a five-number summary?The second quartile for the numbers 231, 423, 521.139347, 400, 345 is D. 423. The second quartile is also known as the median, which is the middle value when the data is arranged in ascending order.
The measure of variability that is dependent on every value in a set of data is C. Range. The range is calculated by subtracting the minimum value from the maximum value and thus considers every value in the dataset.
The statistic unaffected by outliers is B. Interquartile range. The interquartile range is the difference between the first quartile (Q1) and the third quartile (Q3), and it only considers the middle 50% of the data, making it robust to outliers.
The statement about the mean that is not true is D. It is equal to the median in symmetric distributions. While the mean and median can be equal in symmetric distributions, it is not always the case. The mean is affected by extreme values, unlike the median, which is a measure of central tendency and is not influenced by extreme values.
In statistics, a population consists of C. All subjects or objects whose characteristics are being studied. A population refers to the entire group of interest that is being studied, and it can include people, objects, or any other entities that share common characteristics.
The shape of a distribution is given by B. Skewness. Skewness measures the asymmetry of a distribution. It indicates whether the data is skewed to the left (negative skewness), skewed to the right (positive skewness), or symmetric (zero skewness).
In a five-number summary, the statistic not included is C. Mean. The five-number summary includes the minimum value, the first quartile (Q1), the median, the third quartile (Q3), and the maximum value. It does not include the mean.
If a particular set of data is approximately normally distributed, approximately D. All of the above. In a normal distribution, approximately 68% of the observations fall within one standard deviation around the mean, approximately 95% fall within two standard deviations, and approximately 99.7% fall within three standard deviations.
An appropriate null hypothesis is A. The difference between the means of two populations is equal to 0. The null hypothesis states that there is no significant difference between the means of two populations. It is typically denoted as H₀ and is tested against an alternative hypothesis (H₁).
Students taking a sample examination on the first day of classes and then re-taking it at the end of the course would involve B. Dependent data. The scores of the students are dependent because they are measured on the same individuals at different times. The second measurement is related to the first measurement for each student.
If the p-value is less than alpha (c) in a two-tail test, B. The null hypothesis should be rejected. The p-value represents the probability of obtaining the observed data, assuming the null hypothesis is true. If the p-value is smaller than the significance level (alpha), it provides evidence to reject the null hypothesis in favor of the alternative hypothesis.
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angle x is a third quadrant angle such that cosx=−15. what is the exact value of cos(x2)? enter your answer, in simplest radical form, in the box. cos(x2) =
The exact value of cos(x/2) is sqrt(-7).
Let's first determine the value of sin(x) using the given information. Since x is a third-quadrant angle, cosine is negative, so cos(x) = -15/1, which means the adjacent side is -15 and the hypotenuse is 1. By using the Pythagorean identity sin^2(x) + cos^2(x) = 1, we can solve for sin(x):
sin^2(x) + (-15/1)^2 = 1
sin^2(x) + 225/1 = 1
sin^2(x) = 1 - 225/1
sin^2(x) = -224/1
Since x is a third-quadrant angle, sin(x) is also negative. Therefore, sin(x) = -sqrt(224).
To find cos(x/2), we can use the half-angle identity for cosine, which states that cos(x/2) = sqrt((1 + cos(x))/2). Substituting the value of cos(x) we found earlier:
cos(x/2) = sqrt((1 - 15)/2)
cos(x/2) = sqrt(-14/2)
cos(x/2) = sqrt(-7)
Thus, the exact value of cos(x/2) is sqrt(-7).
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Charmain and Dix require a program to determine the probability of any 2 students in the WRSC111 class having exactly the same mark for the WRSC111 test. They have contracted you to develop the program. You are required to ANALYSE, DESIGN and IMPLEMENT a script solution that solves this problem using the following methods: • A function numStudents that continuously requests the user for the number of students registered for WRSC111 until a positive value is entered. This positive number is returned by the function • A function generate Marks that generates a list of n random marks in the range 0 – 100, where n is the input argument. Each mark is rounded to the nearest integer. The list of marks is returned by the function • A function check that takes a list of marks and returns true if any mark is duplicated in the list, otherwise returns false • The main script file that uses the functions written above to generate and check 25000 lists of marks for a WRSC111 class, the number of students obtained from the user. The program must determine and display the probability of any 2 students in the WRSC111 class having exactly the same mark
The script will prompt the user for the number of students, generate 25000 lists of marks for that number of students, check for duplicates in each list, calculate the probability of duplicate marks, and display the result.
Here's an example of how you can analyze, design, and implement a script solution to solve the problem:
1. Analysis:
- We need to create three functions: `numStudents`, `generateMarks`, and `check`.
- `numStudents` will take user input to get the number of students registered for WRSC111.
- `generateMarks` will generate a list of random marks based on the given number of students.
- `check` will check if any mark in the list is duplicated.
- The main script will use these functions to generate and check 25000 lists of marks for a WRSC111 class.
2. Design:
- Function `numStudents`:
- Initialize a variable `num` to 0.
- Use a loop to continuously request user input for `num` until a positive value is entered.
- Return the positive value entered by the user.
- Function `generateMarks(n)`:
- Initialize an empty list `marks`.
- Use a loop to generate `n` random marks in the range of 0-100.
- Round each mark to the nearest integer and append it to the `marks` list.
- Return the `marks` list.
- Function `check(marks)`:
- Convert the `marks` list to a set.
- Compare the length of the `marks` list with the length of the set.
- If the lengths are different, it means there are duplicate marks, so return `True`.
- Otherwise, return `False`.
- Main script:
- Call the `numStudents` function to get the number of students.
- Initialize a variable `duplicateCount` to 0.
- Use a loop to generate and check 25000 lists of marks:
- Call the `generateMarks` function with the number of students as the argument.
- Call the `check` function with the generated marks list.
- If the result is `True`, increment `duplicateCount`.
- Calculate the probability of two students having the same mark: `probability = duplicateCount / 25000`.
- Display the probability.
3. Implementation:
Here's an example implementation of the solution in Python:
```python
import random
def numStudents():
num = 0
while num <= 0:
num = int(input("Enter the number of students registered for WRSC111: "))
return num
def generateMarks(n):
marks = []
for _ in range(n):
mark = round(random.uniform(0, 100))
marks.append(mark)
return marks
def check(marks):
return len(marks) != len(set(marks))
def main():
num = numStudents()
duplicateCount = 0
for _ in range(25000):
marks = generateMarks(num)
if check(marks):
duplicateCount += 1
probability = duplicateCount / 25000
print("Probability of any 2 students having exactly the same mark:", probability)
# Run the main script
main()
```
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Consider the function f(x)=x^3−3x^2.
(a) Using derivatives, find the intervals on which the graph of f(x) is increasing and decreasing.
(b) Using your work from part (a), find any local extrema.
(c) Using derivatives, find the intervals on which the graph of f(x) is concave up or concave down.
(d) Using your work from part (c), find any points of inflection.
(a) The graph of f(x) is increasing on the intervals (-∞, 0) and (2, ∞), and decreasing on the interval (0, 2).
(b) The local maximum occurs at x = 0 and the local minimum occurs at x = 2.
(c) The graph of f(x) is concave up on the interval (1, ∞) and concave down on the interval (-∞, 1).
(d) The point of inflection occurs at x = 1.
(a) To find the intervals on which the graph of f(x) is increasing or decreasing, we need to analyze the sign of the derivative of f(x).
Step 1: Find the derivative of f(x).
f'(x) = d/dx(x³ - 3x²) = 3x² - 6x
Step 2: Set the derivative equal to zero and solve for x to find critical points.
3x² - 6x = 0
Factor out common terms:
3x(x - 2) = 0
This gives two critical points: x = 0 and x = 2.
Step 3: Determine the sign of the derivative in different intervals.
We choose test points within each interval and evaluate the derivative at those points.
Test x = -1:
f'(-1) = 3(-1)² - 6(-1) = 3 + 6 = 9 (positive)
Test x = 1:
f'(1) = 3(1)² - 6(1) = 3 - 6 = -3 (negative)
Test x = 3:
f'(3) = 3(3)² - 6(3) = 27 - 18 = 9 (positive)
Based on these results, we can determine the intervals of increasing and decreasing.
Intervals of increasing: (-∞, 0) and (2, ∞)
Intervals of decreasing: (0, 2)
(b) Local extrema occur at the critical points of the function. From part (a), we found the critical points x = 0 and x = 2.
To determine if these critical points are local extrema, we can analyze the sign of the derivative around these points.
For x = 0:
f'(-1) = 9 (positive) to the left of 0
f'(1) = -3 (negative) to the right of 0
Since the derivative changes sign from positive to negative, x = 0 is a local maximum.
For x = 2:
f'(1) = -3 (negative) to the left of 2
f'(3) = 9 (positive) to the right of 2
Since the derivative changes sign from negative to positive, x = 2 is a local minimum.
(c) To find the intervals of concavity for the graph of f(x), we need to analyze the sign of the second derivative, f''(x).
Step 1: Find the second derivative of f(x).
f''(x) = d/dx(3x² - 6x) = 6x - 6
Step 2: Set the second derivative equal to zero and solve for x to find any inflection points.
6x - 6 = 0
6x = 6
x = 1
Step 3: Determine the sign of the second derivative in different intervals.
Test x = 0:
f''(0) = 6(0) - 6 = -6 (negative)
Test x = 2:
f''(2) = 6(2) - 6 = 6 (positive)
Based on these results, we can determine the intervals of concavity.
Intervals of concave up: (1, ∞)
Intervals of concave down: (-∞, 1)
(d) The point of inflection occurs at x = 1 since the second derivative changes sign from negative to positive at that point.
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An angle's initial ray points in the 3-o'clock direction and its terminal ray rotates CCW. Let θ represent the angle's varying measure (in radians).
a. If θ =0.2, what is the slope of the terminal ray?
b. If θ =1.75, what is the slope of the terminal ray?
c. Write an expression (in terms of θ ) that represents the varying slope of the terminal ray.
Given that an angle's initial ray points in the 3-o'clock direction and its terminal ray rotates counter-clockwise. Let θ represent the angle's varying measure (in radians).a) If θ = 0.2, the slope of the terminal ray is calculated as follows. We know that the angle's initial ray points in the 3-o'clock direction, i.e., in the x-axis direction, so the initial ray's slope will be 0. For terminal ray, We use the slope formula, i.e., slope = (y2 - y1) / (x2 - x1).
Where (x1, y1) is the point where the initial ray meets the origin, and (x2, y2) is a point on the terminal ray. Terminal ray makes an angle of θ with the initial ray; then it means its direction angle is θ. We know that the slope of a line that makes an angle of α with the positive x-axis is tan(α). So the slope of the terminal ray is slope = tan(θ).Slope of the terminal ray at θ = 0.2 is slope = tan(0.2) = 0.20271.b) If θ = 1.75, the slope of the terminal ray is calculated as follows.
Using the same formula slope = (y2 - y1) / (x2 - x1) with the direction angle as θ, we have the slope as follows, slope = tan(θ) = tan(1.75) = - 2.57215c). The slope of the terminal ray at any angle θ is slope = tan(θ). Thus, the expression (in terms of θ) that represents the varying slope of the terminal ray is Slope = tan(θ).
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a particle moves on the hyperbola xy=15 for time t≥0 seconds. at a certain instant, x=3 and dxdt=6. which of the following is true about y at this instant?
when the particle is moving on the hyperbola xy = 15, at the instant when x = 3 and dx/dt = 6, the value of y is 5.
At the instant when x = 3 and dx/dt = 6, the value of y can be determined as follows:
Given: The particle moves on the hyperbola xy = 15.
We are interested in finding the value of y at the instant when x = 3 and dx/dt = 6.
We can rewrite the equation of the hyperbola as y = 15/x.
To find the value of y at x = 3, substitute x = 3 into the equation obtained in step 3: y = 15/3 = 5.
Therefore, at the instant when x = 3 and dx/dt = 6, the value of y is 5.
In summary, when the particle is moving on the hyperbola xy = 15, at the instant when x = 3 and dx/dt = 6, the value of y is 5.
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A function is given
h(t) = 2t2 − t; t = 5, t = 6
(a) Determine the net change between the given values of the variable.
(b) Determine the average rate of change between the given values of the variable.
(a) The net change from t = 5 to 6 is 17, and (b) the average rate of change is also 17.
a) To find the net change, we evaluate the function h(t) at t = 6 and subtract the value at t = 5.
h(6) = 2(6)² - 6 = 72 - 6 = 66
h(5) = 2(5)² - 5 = 50 - 5 = 45
Net change = h(6) - h(5) = 66 - 45 = 17.
b) In this case, the difference in function values is 17 (as calculated in part (a)), and the difference in variable values is 6 - 5 = 1. Thus, the average rate of change = net change / difference in variable values = 17 / 1 = 17.
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Find the equation of the plane containing the points 10,1,2),8(1,33), and 0-132) Then find the point where this plane intersects the line r(t) =< 2t, t-1, t+2>
The equation of the plane containing the points (10,1,2), (8,1,33), and (0,-1,32) is 31x - 248y + 62z = 186. The point where this plane intersects the line r(t) = <2t, t-1, t+2> is (3, 1/2, 7/2).
To find the equation of the plane containing the points (10,1,2), (8,1,33), and (0,-1,32), we can use the point-normal form of the equation of a plane.
Find two vectors in the plane
Let's take the vectors v1 = (10,1,2) - (8,1,33) = (2,0,-31) and v2 = (0,-1,32) - (8,1,33) = (-8,-2,-1).
Find the cross product of the two vectors
Taking the cross product of v1 and v2, we have n = v1 × v2 = (0-(-31), (-8)(-31) - (-2)(0), (-8)(0) - (-2)(-31)) = (31, -248, 62).
Write the equation of the plane
Using the point-normal form of the equation of a plane, the equation of the plane is given by:
31(x - 10) - 248(y - 1) + 62(z - 2) = 0
31x - 310 - 248y + 248 + 62z - 124 = 0
31x - 248y + 62z - 186 = 0
31x - 248y + 62z = 186
Therefore, the equation of the plane containing the points (10,1,2), (8,1,33), and (0,-1,32) is 31x - 248y + 62z = 186.
To find the point where this plane intersects the line r(t) = <2t, t-1, t+2>, we substitute the parametric equation of the line into the equation of the plane and solve for t.
Substituting x = 2t, y = t-1, and z = t+2 into the equation 31x - 248y + 62z = 186, we have:
31(2t) - 248(t-1) + 62(t+2) = 186
62t - 248t + 248 + 62t + 124 = 186
-124t + 372 = 186
-124t = -186
t = -186 / -124
t = 3/2
Substituting t = 3/2 back into the parametric equation of the line, we have:
x = 2(3/2) = 3
y = (3/2) - 1 = 1/2
z = (3/2) + 2 = 7/2
Therefore, the point where the plane intersects the line r(t) = <2t, t-1, t+2> is (3, 1/2, 7/2).
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The percent of births to toenage mothers that are out-of-wedlock can be approximated by a linear function of the number of years after 1951. The percent was 19 in 1968 and 76 in 2004. Complete parts (a) through (c) (a) What is the slope of the line joining the points (17,19) and (53,76)? The slope of the line is (Simplify your answer. Round to two decimal places as needed.) (b) What is the average rate of change in the percent of teenage out-of-wedlock births over this period? The average rate of change in the percent of teenago out-of-wedlock births over this period is (Simplify your answer. Round to two decimal places as needed.) (c) Use the slope from part (a) and the number of teenage mothers in 2004 to write the equation of the line The equation is p-D (Do not factor. Type an expression using x as the variable.)
a. The slope of the line is found to be 1.58.
b. The average rate of change is 1.58.
c. the equation of the line is p = 1.58x - 7.86.
How do we calculate?(a)
slope = (change in y) / (change in x)
change in y = 76 - 19 = 57
change in x = 53 - 17 = 36
slope = 57 / 36
slope = 1.58
(b) the average rate of change is 1.58 because average rate of change is equals to the slope
(c)
The points are:
(17, 19) and (53, 76).
p - 19 = 1.58(x - 17)
p - 19 = 1.58x - 26.86
p = 1.58x - 7.86
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In the past, patrons of a cinema complex have spent an average of $2.50 for popcorn and other snacks. The amounts of these expenditures have been normally distributed. Following an intensive publicity campaign by a local medical society, the mean expenditure for a sample of 18 patrons is found to be $2.10. The standard deviation is found to be $0.90. Which of the following represents an 80% confidence interval for the population average amount spent by patrons of a cinema complex on popcorn and other snacks following an intensive publicity campaign by a local medical society? ($1.65, $2.55) ($1.73, $2.47) ($1.49, $2.71) ($1.82, $2.38) ($1.56, $2.64)
The 80% confidence interval for the population average amount spent by patrons of a cinema complex on popcorn and other snacks following an intensive publicity campaign by a local medical society is ($1.73, $2.47).
Given that the mean expenditure for a sample of 18 patrons is found to be $2.10 with standard deviation of $0.90, the 80% confidence interval for the population average amount spent by patrons of a cinema complex on popcorn and other snacks following an intensive publicity campaign by a local medical society is ($1.73, $2.47).What is the confidence interval?A confidence interval is a range of values that includes an estimated population parameter at a certain level of confidence. A confidence interval is a statistical tool that helps to express the precision of an estimate and not the precision of individual data points.
A confidence interval is calculated by taking the point estimate and adding and subtracting a margin of error. The margin of error is a measure of the uncertainty of the estimate of the population parameter. The margin of error is generally calculated using a multiplier called the standard error.
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The given information can be used to find an 80% confidence interval for the population average amount spent by patrons of a cinema complex on popcorn and other snacks following an intensive publicity campaign by a local medical society.
To find the 80% confidence interval for the population average amount spent by patrons of a cinema complex on popcorn and other snacks following an intensive publicity campaign by a local medical society, we use the formula below;
[tex]\overline{X} \pm Z_{\alpha/2}\frac{\sigma}{\sqrt{n}}[/tex]Where;[tex]\overline{X}[/tex] = sample meanZ[sub]α/2[/sub] = the Z-score that corresponds to the level of confidence (α)σ = the standard deviationn = the sample sizeWe have been given;
Sample size (n) = 18
Sample mean ([tex]\overline{X}[/tex]) = $2.10
Population mean = $2.50
Standard deviation (σ) = $0.90
Level of confidence = 80%
The first thing to do is to find the Z-score that corresponds to the 80% level of confidence. We can do that using a Z-table or calculator. Using a calculator, we get;
Z[sub]α/2[/sub] = invNorm(1 - α/2)Z[sub]0.80/2[/sub] = invNorm(1 - 0.80/2)Z[sub]0.40[/sub] = invNorm(0.70)Z[sub]0.40[/sub] = ±0.2533
Therefore, Z[sub]α/2[/sub] = ±0.2533
Substituting all the values into the formula above, we get;
[tex]\overline{X} \pm Z_{\alpha/2}\frac{\sigma}{\sqrt{n}}[/tex][tex]2.10 \pm 0.2533\frac{0.90}{\sqrt{18}}[/tex][tex]2.10 \pm 0.24[/tex][tex](2.10 - 0.24, 2.10 + 0.24)[/tex][tex](1.86, 2.34)[/tex]
Therefore, an 80% confidence interval for the population average amount spent by patrons of a cinema complex on popcorn and other snacks following an intensive publicity campaign by a local medical society is ($1.86, $2.34). Hence, the correct option is [D] ($1.82, $2.38).
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The number of elements of Z3[x] /<] + x> is 6 9 8 O 3 Question * The number of reducible monic polynomials of degree 2 over Zz is: 2 6 O 4 8
The number of reducible monic polynomials of degree 2 over Zz would be 8.
The given question can be solved as follows:
Given that Z3[x] / has 6 elements.
We know that if a polynomial is monic then the coefficient of the leading term is always 1.
So the general form of a monic polynomial of degree 2 over Z3 is given by x^2 + bx + c where b and c are integers such that 0 ≤ b, c ≤ 2. So, there are 3 choices of b and 3 choices of c, making 3 x 3 = 9 such polynomials.However, we need to exclude the irreducible polynomials from this set. There is only one monic irreducible polynomial of degree 2 over Z3, which is x^2 + 1.
Therefore, there are 9 - 1 = 8 reducible monic polynomials of degree 2 over Z3. So the answer is 8.The correct option is O which is 0.
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The answer is 2.
The number of elements of Z3[x] /<] + x> is 9. We have to find the number of reducible monic polynomials of degree 2 over Zz. What is Zz? Assuming that you are referring to Z2, which is the field of integers modulo 2.
The polynomial of degree 2 over Z2 can be expressed as ax² + bx + c. In general, we can reduce any polynomial over Z2 by taking the modulo 2 of all coefficients of the polynomial. For instance, 3x² + 4x + 5 ≡ x² + x + 1 (mod 2). The polynomial can be reducible over Z2 if and only if it has a linear factor. In other words, we must have a non-zero x such that ax² + bx + c ≡ (x - r)(x - s) (mod 2), where r and s are some constants in Z2.
Then we expand the right side and equate the coefficients of x², x, and the constant term to the coefficients of ax² + bx + c. We get that r + s = b/a and rs = c/a. This means that we must have a solution in Z2 for the system of equations:r + s ≡ b/a (mod 2)rs ≡ c/a (mod 2)If this is true, then the polynomial is reducible over Z2 and has a linear factor.
If not, then the polynomial is irreducible over Z2. Therefore, we can enumerate all possible values of (b/a, c/a) in Z2², and check for each pair if there exists a corresponding r and s.
There are 4 possible pairs in Z2², namely {(0, 0), (0, 1), (1, 0), (1, 1)}. For each pair, we can compute b/a and c/a and check if they have a solution in Z2. The total number of reducible monic polynomials of degree 2 over Z2 is the number of pairs that satisfy the system of equations:2/1. {b/a = 0, c/a = 0}.
This pair gives the polynomial x². It has a linear factor x.2/2. {b/a = 0, c/a = 1}. This pair gives the polynomial x² + 1. It is irreducible over Z2.2/3. {b/a = 1, c/a = 0}. This pair gives the polynomial x² + x. It is reducible since x(x + 1) ≡ x² + x ≡ x(x + 1) (mod 2).2/4. {b/a = 1, c/a = 1}.
This pair gives the polynomial x² + x + 1. It is irreducible over Z2.
Therefore, there are 2 reducible monic polynomials of degree 2 over Z2. Answer: 2.
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Write inequalities that describe the following statements. (But don't solve them!) a) The sum of two natural numbers is less than 22. b) A computer company manufacturers tablets and personal computers. The plant equipment limits the total number of both that can manufactured in one day. No more than 180 can be produced in one day. c) A farmer grows tomatoes and potatoes. At most, $9,000 can be spent on seeding costs and it costs $100/acre to plant tomatoes and $200/acre to plant potatoes. d) Wei owns a pet store and wishes to buy at least 8 cats and 10 dogs from a breeder. Cats cost $35 each and dogs cost $150 dollars each. Wei does not want to spend more than $1,700 in total.
a) The sum of two natural numbers is x + y < 22.
b) The total number of tablets and personal computers manufactured is t + c ≤ 180.
c) The spending limit on seeding costs for tomatoes and potatoes is 100t + 200p ≤ 9,000.
d) The minimum number of cats and dogs Wei wants to buy from the breeder is c ≥ 8, d ≥ 10, and the total cost is 35c + 150d ≤ 1,700.
a) Let x and y be natural numbers. The inequality representing the sum of two natural numbers being less than 22 is x + y < 22.
b) Let t represent the number of tablets and c represent the number of personal computers manufactured in one day. The inequality representing the plant equipment limitation is t + c ≤ 180.
c) Let t represent the number of acres planted with tomatoes and p represent the number of acres planted with potatoes. The inequality representing the seeding cost limitation is 100t + 200p ≤ 9,000.
d) Let c represent the number of cats and d represent the number of dogs bought from the breeder. The inequalities representing the number of pets and cost limitations are c ≥ 8, d ≥ 10, and 35c + 150d ≤ 1,700.
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Suppose the stats professor wanted to determine whether the average score on Assignment 1 in one stats class differed significantly from the average score on Assignment 1 in her second stats class. State the null and alternative hypotheses.
The null and alternative hypotheses for determining whether the average score on Assignment 1 differs significantly between the two stats classes can be stated as follows:
Null Hypothesis (H₀): The average score on Assignment 1 is the same in both stats classes.
Alternative Hypothesis (H₁): The average score on Assignment 1 differs between the two stats classes.
In other words, the null hypothesis assumes that there is no significant difference in the average scores on Assignment 1 between the two classes, while the alternative hypothesis suggests that there is a significant difference in the average scores.
The purpose of conducting hypothesis testing is to gather evidence to either support or reject the null hypothesis in favor of the alternative hypothesis.
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Let S represent the statement, 16 +16-2² +16.3²+...+16n²= 8n(n+1)(2n+1)/3
(a) Verify S₁
(b) Write Sk
(c) Write S_k+1
a) S₁ is verified.
b) Sk represents the sum up to the kth term of the series which is Sk = 16 + 16 - 2² + 16 * 3² + ... + 16k²
c) S_k+1 represents the sum up to the (k+1)th term which is S_k+1 = Sk + 16(k+1)²
The statement S₁ is verified by plugging in n=1. Sk represents the sum up to the kth term of the series, and S_k+1 represents the sum up to the (k+1)th term.
(a) To verify S₁, we substitute n=1 into the equation:
16 + 16 - 2² + 16 * 3² = 8 * 1 * (1 + 1) * (2 * 1 + 1) / 3
This simplifies to:
16 + 16 - 4 + 16 * 9 = 8 * 1 * 2 * 3 / 3
16 + 16 + 144 = 48
176 = 48, which is true. Thus, S₁ is verified.
(b) Sk represents the sum up to the kth term of the series. To find Sk, we sum up the terms from n=1 to n=k:
Sk = 16 + 16 - 2² + 16 * 3² + ... + 16k²
(c) S_k+1 represents the sum up to the (k+1)th term. To find S_k+1, we add the (k+1)th term to Sk:
S_k+1 = Sk + 16(k+1)²
This step-by-step approach allows us to verify S₁ by substituting n=1 into the equation and showing that it holds true. Then, we define Sk as the sum up to the kth term, and S_k+1 as the sum up to the (k+1)th term by adding the (k+1)th term to Sk. These formulas provide a framework to calculate the sum of terms in the series for any given value of n.
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In Linear programming, there are two general types of objectives, maximization, and minimization. Of the four components that provide the structure of a linear programming model, the component that reflects what we are trying to achieve is called the (two words) 14. (5 points total) Use Excel to conduct a linear programming analysis. Make sure that all components of the linear programming model, to include your decision variables, objective function, constraints and parameters are shown in your work A small candy shop is preparing for the holiday season. The owner must decide how many bags of deluxe mix and how many bags of standard mix of Peanut Raisin Delite to put up. The deluxe mix has 75 pounds of raisings and 25 pounds of peanuts, and the standard mix has 0.4 pounds of raisins and 60 pounds of peanuts per bag. The shop has 90 pounds of raisins in stock and 60 pounds of peanuts Peanuts cost $0.75 per pound and raisins cost $2 per pound. The deluxe mix will sell for $3.5 for a one-pound bag, and the standard mix will sell for $2.50 for a one-pound bag. The owner estimates that no more than 110 bags of one type can be sold. Answer the following: a. Prepare an Excel sheet with all required data and solution (2 points) b. How many constraints are there, including the non-negativity constraints? (1 point) c. To maximize profits, how many bags of each mix should the owner prepare? (1 point) d. What is the expected profit?
The objective is to maximize profits. By setting up the necessary data and solving the problem in Excel, you can determine the optimal number of bags for each mix and calculate the expected profit.
In Excel, you can set up the linear programming model by creating a spreadsheet with the necessary data. This includes the ingredient quantities, ingredient costs, selling prices, and any constraints on the maximum number of bags. By defining the decision variables and setting up the objective function to maximize profits, you can use Excel's solver tool to find the optimal solution.
The number of constraints in this problem includes the non-negativity constraints for the number of bags of each mix and the constraints on the maximum number of bags that can be sold.
To maximize profits, Excel's solver tool will provide the optimal solution by indicating the number of bags for each mix that the owner should prepare.
The expected profit can be calculated by multiplying the number of bags for each mix by the selling price and subtracting the cost of ingredients. This will give the total profit for the selected bag quantities.
By following these steps and setting up the problem in Excel, you can determine the optimal production quantities, the expected profit, and make informed decisions for the candy shop's holiday season.
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Let T: R³ → R$ where T(u) is the reflection of u across the plane x - 3y + z = 0. A. (s) Find the matrix that represents this transformation.
The resulting matrix is [1/11 0 0; -3/11 1 0; 1/11 0 1], which represents the transformation T.
Step 1: Determine the basis vectors:
To find the matrix representing the reflection transformation T, we need to start by considering the effect of the transformation on the standard basis vectors of R³: i = [1, 0, 0], j = [0, 1, 0], and k = [0, 0, 1].
Step 2: Apply the transformation to the basis vectors:
Apply the reflection transformation T to each of the basis vectors separately. This will give us the images of the basis vectors under the reflection.
For the vector i = [1, 0, 0]:
To reflect i across the plane x - 3y + z = 0, we substitute i into the equation of the plane:
1 - 3(0) + 0 = 0
1 = 0
Since this equation is not satisfied, we need to find a point on the plane that is closest to i. To do this, we find the orthogonal projection of i onto the plane.
The normal vector of the plane is n = [1, -3, 1]. To find the projection of i onto the plane, we use the formula:
projₙ(i) = (i · n / ||n||²) * n
where · denotes the dot product and ||n|| denotes the norm (magnitude) of n.
Calculating the projection, we have:
projₙ(i) = ([1, 0, 0] · [1, -3, 1] / ||[1, -3, 1]||²) * [1, -3, 1]
= (1 / (1² + (-3)² + 1²)) * [1, -3, 1]
= (1 / 11) * [1, -3, 1]
= [1/11, -3/11, 1/11]
This is the image of i under the reflection transformation T.
Similarly, we can find the images of j and k. However, since the equation of the plane does not involve y or z, the reflection will not affect these coordinates. Therefore, the images of j and k will be the same as the original vectors: j = [0, 1, 0] and k = [0, 0, 1].
Step 3: Form the matrix:
Now that we have the images of the basis vectors, we can form the matrix that represents the transformation T. The columns of the matrix will be the images of the basis vectors.
The matrix is formed as follows:
[1/11 0 0]
[-3/11 1 0]
[1/11 0 1]
This is the matrix that represents the reflection transformation T.
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When calculating the probability P(z ≥ -1.65) under the Standard
Normal Curve we obtain:
When calculating the probability P(z ≥ -1.65) under the Standard Normal Curve, we obtain the area to the right of -1.65 on the standard normal distribution. This probability represents the proportion of values that are greater than or equal to -1.65 in a standard normal distribution.
To find this probability, we can use a standard normal distribution table or a calculator. Looking up the value of -1.65 in the table or using the calculator, we find that the corresponding area or probability is approximately 0.9505.
Therefore, the probability P(z ≥ -1.65) is approximately 0.9505 or 95.05%. This means that approximately 95.05% of the values in a standard normal distribution are greater than or equal to -1.65.
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identify the factors of x2 36y2.
prime
(x 6y)(x − 6y)
(x 6y)(x 6y)
(x − 6y)(x − 6y)
The factors of x^2 36y^2 are:
(x + 6y)(x - 6y)
Express the confidence interval 77.1% ± 3.8 % in interval form. ______
Express the answer in decimal format (do not enter as percents).
The confidence interval of 77.1% ± 3.8% can be expressed in interval form as (73.3%, 80.9%) in decimal format.
A confidence interval is a range of values within which the true value of a population parameter is estimated to fall with a certain level of confidence. In this case, the confidence interval is centered around 77.1% with a width of 3.8%. To express it in interval form, we subtract and add half of the width from the center value.
To convert the percentages to decimals, we divide the percentages by 100. Therefore, the lower bound of the interval is (77.1% - 3.8%) / 100 = 0.733, or 73.3% in decimal form. Similarly, the upper bound is (77.1% + 3.8%) / 100 = 0.809, or 80.9% in decimal form.
Thus, the confidence interval 77.1% ± 3.8% can be expressed in interval form as (0.733, 0.809) in decimal format.
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The weights of four randomly and independently selected bags of potatoes labeled 20.0 pounds were found to be 20.9, 21.4, 20.7, and 21.2 pounds. Assume Normality. Answer parts (a) and (b) below. a. Find a 95% confidence interval for the mean weight of all bags of potatoes. (Type integers or decimals rounded to the nearest hundredth as needed. Use ascending order).
Given Information: The weights of four randomly and independently selected bags of potatoes labeled 20.0 pounds were found to be 20.9, 21.4, 20.7, and 21.2 pounds. Assuming Normality, we need to find a 95% confidence interval for the mean weight of all bags of potatoes.
Formula used: The formula used to find the confidence interval is: \[{\bar x} \pm {t_{\alpha / 2,\:df}}\frac{s}{\sqrt{n}}\]where \({\bar x}\) is the sample mean, \(s\) is the sample standard deviation, \(n\) is the sample size, \(df\) is the degree of freedom and \(t_{\alpha / 2,\:df}\) is the t-score.
Part (a): To find the confidence interval at 95% level of confidence, the degree of freedom can be calculated as,\[{df} = n - 1 = 4-1 = 3\] Now, the value of t-score for 95% confidence level and 3 degrees of freedom is 3.182.To find the sample mean, \[\bar x = \frac{20.9+21.4+20.7+21.2}{4}=21.05\]
Now, we need to find the sample standard deviation. Sample standard deviation can be calculated as: \[{s} = \sqrt{\frac{1}{n-1}\sum_{i=1}^{n}(x_i-\bar x)^2}\]where, \(x\) is the given data. Substituting the values,\[{s}=\sqrt{\frac{1}{4-1}\left[(20.9-21.05)^2+(21.4-21.05)^2+(20.7-21.05)^2+(21.2-21.05)^2\right]}\]\[{s} = 0.2683\]
Now, substituting the values in the formula, the confidence interval is,\[\begin{align}{\bar x} \pm {t_{\alpha / 2,\:df}}\frac{s}{\sqrt{n}}&=21.05 \pm 3.182\frac{0.2683}{\sqrt{4}}\\&=21.05 \pm 0.4295\end{align}\]
So, the 95% confidence interval for the mean weight of all bags of potatoes is (20.62, 21.48).
Therefore, the correct answer is (20.62, 21.48).
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Which of the following properties does R satisfy? Define a relation on N by (a,b) e gif and only if b Reflexive Symmetric Antisymmetric Transitive
The relation R defined on N by (a, b) ∈ R if and only if b is greater than or equal to a, satisfies the properties of reflexive, transitive, and antisymmetric, but not symmetric.
To determine whether the relation R satisfies each of the properties, we can analyze its characteristics.
1. Reflexive: A relation R on a set A is reflexive if every element of A is related to itself. In this case, for every natural number a, (a, a) ∈ R because a is greater than or equal to itself. Therefore, R is reflexive.
2. Symmetric: A relation R on a set A is symmetric if for every pair (a, b) ∈ R, the pair (b, a) ∈ R as well. However, in the given relation R, if (a, b) ∈ R, it means that b is greater than or equal to a. But it does not imply that a is greater than or equal to b. Hence, R is not symmetric.
3. Antisymmetric: A relation R on a set A is antisymmetric if for every distinct pair (a, b) ∈ R, the pair (b, a) ∉ R. In the given relation R, if (a, b) ∈ R and (b, a) ∈ R, then a = b. Since a and b are distinct natural numbers, they cannot be equal. Therefore, R is antisymmetric.
4. Transitive: A relation R on a set A is transitive if for every triple (a, b) ∈ R and (b, c) ∈ R, the pair (a, c) ∈ R as well. In the given relation R, if (a, b) ∈ R and (b, c) ∈ R, then b is greater than or equal to a, and c is greater than or equal to b. Therefore, c is also greater than or equal to a, implying that (a, c) ∈ R. Hence, R is transitive.
In summary, the relation R defined on N by (a, b) ∈ R if and only if b is greater than or equal to a satisfies the properties of reflexive, antisymmetric, and transitive, but it is not symmetric.
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Which transformations could have taken place? Select
two options.
Ro, 90°
Ro, 180°
Ro, 270"
Ro, -90°
Ro, -270°
Answer:
Ro 90
Ro - 270
Step-by-step explanation:
Draw it to figure it out
The two possible transformations that could have taken place are:
Ro, 90°
Ro, -270°
Here, we have,
To determine which transformations could have taken place for the given vertex to be located at (2, 3) after rotation, we need to consider the change in coordinates.
The original vertex is at (3, -2), and after rotation, it is located at (2, 3).
Let's analyze the changes in the x-coordinate and y-coordinate separately:
Change in x-coordinate: From 3 to 2, there is a decrease of 1 unit.
Change in y-coordinate: From -2 to 3, there is an increase of 5 units.
Based on these changes, we can conclude that the rotation involved a combination of rotation and reflection.
The options that involve rotation are:
Ro, 90° (rotating counterclockwise by 90 degrees)
Ro, -90° (rotating clockwise by 90 degrees)
The options that involve rotation and reflection are:
Ro, 270° (rotating counterclockwise by 270 degrees, which is the same as rotating clockwise by 90 degrees with reflection)
Ro, -270° (rotating clockwise by 270 degrees, which is the same as rotating counterclockwise by 90 degrees with reflection)
Therefore, the two possible transformations that could have taken place are:
Ro, 90°
Ro, -270°
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find the value of the variable for each polygon
The value of g from the given triangle is 24 degree.
The given triangle is isosceles triangle with base angles are equal.
Here, base angles are 3g°.
From the given triangle, we have
3g°+3g°+(g+12)°=180° (Sum of interior angles of triangle is 180°)
7g°+12°=180°
7g°=168°
g=24°
Therefore, the value of g from the given triangle is 24 degree.
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Let A = {10,20,30). Find one non-empty relation on set A such that all the given conditions are met and explain why it works: Not Reflexive, Not Transitive, Antisymmetric. (Find one relation on A that satisfies all three at the same time - don't create three different relations).
Previous question
R = {(10, 20), (20, 30), (30, 10)} is one non-empty relation on set A that satisfies all three conditions.
One non-empty relation on set A that satisfies all three conditions (not reflexive, not transitive, and antisymmetric) is:
R = {(10, 20), (20, 30), (30, 10)}
Explanation:
1. Not Reflexive: A relation is reflexive if every element of the set is related to itself. In this case, the relation R does not include any pairs where an element is related to itself, such as (10, 10), (20, 20), or (30, 30). Therefore, it is not reflexive.
2. Not Transitive: A relation is transitive if whenever (a, b) and (b, c) are in the relation, then (a, c) must also be in the relation. In this case, the relation R includes (10, 20) and (20, 30), but it does not include (10, 30). Therefore, it is not transitive.
3. Antisymmetric: A relation is antisymmetric if for any distinct elements (a, b) and (b, a) in the relation, it implies that a = b. In this case, the relation R includes (10, 20) and (20, 10), but it does not satisfy a = b since 10 ≠ 20. Therefore, it is antisymmetric.
By selecting this specific relation R, we meet all three conditions simultaneously: not reflexive, not transitive, and antisymmetric.
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9. Show the function f(2)=1+2i + 2 Re(2) is differentiable or not differentiable at any points.
Since the Cauchy-Riemann equations are satisfied for all values of x and y, we can conclude that the function f(z) = 1 + 2i + 2Re(2) is differentiable at all points. Therefore, the function f(z) = 1 + 2i + 2Re(2) is differentiable at any points.
To determine whether the function f(z) = 1 + 2i + 2Re(2) is differentiable or not differentiable at any points, we need to check if the function satisfies the Cauchy-Riemann equations.
The Cauchy-Riemann equations are given by:
∂u/∂x = ∂v/∂y,
∂u/∂y = (-∂v)/∂x,
where u_(x, y) is the real part of f_(z) and v_(x, y) is the imaginary part of f(z).
Let's compute the partial derivatives and check if the Cauchy-Riemann equations are satisfied:
Given f_(z) = 1 + 2i + 2Re(2),
we can see that the real part of f_(z) is u_(x, y) = 1 + 2Re(2),
and the imaginary part of f_(z) is v_(x, y) = 0.
Calculating the partial derivatives:
∂u/∂x = 0,
∂u/∂y = 0,
∂v/∂x = 0,
∂v/∂y = 0.
Now let's check if the Cauchy-Riemann equations are satisfied:
∂u/∂x = ∂v/∂y
0 = 0, which is satisfied.
∂u/∂y = (-∂v)/∂x
0 = 0, which is also satisfied.
Since the Cauchy-Riemann equations are satisfied for all values of x and y, we can conclude that the function f(z) = 1 + 2i + 2Re(2) is differentiable at all points.
Therefore, the function f(z) = 1 + 2i + 2Re(2) is differentiable at any points.
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evaluate the indefinite integral as a power series. x3 ln(1 x) dx
The indefinite integral of [tex]x^3[/tex] ln(1 - x) can be evaluated as a power series expansion. The resulting power series involves a combination of terms with ascending powers of x and coefficients derived from the expansion of ln(1 - x).
To evaluate the indefinite integral of [tex]x^3[/tex] ln(1 - x) as a power series, we can begin by expanding ln(1 - x) using the Taylor series expansion. The Taylor series representation of ln(1 - x) is given by ∑([tex](-1)^n[/tex] * [tex]x^n[/tex])/(n), where n ranges from 1 to infinity.
Next, we substitute this expansion into the original integral. Multiplying [tex]x^3[/tex]by the power series expansion of ln(1 - x), we obtain a series of terms involving different powers of x. By rearranging the terms and integrating each term individually, we can compute the indefinite integral as a power series.
The resulting power series will have terms with ascending powers of x, and the coefficients will be determined by the expansion of ln(1 - x). It is important to note that the power series expansion is valid within a certain interval of convergence, typically determined by the radius of convergence of the original function.
By generating the power series representation of the indefinite integral, we obtain an expression that approximates the integral of [tex]x^3[/tex]ln(1 - x). This allows us to work with the integral in a more convenient form for further analysis or numerical computation, providing a useful tool for solving related problems in calculus and mathematical analysis.
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consider the graph of miriam's bike ride to answer the questions. how many hours did miriam stop to rest? how many hours did it take miriam to bike the initial 8 miles?
a. 0.25 hours
b. 0.75 hours
c. 1 hour
d. 1.25 hours
From the given information, we need to determine the number of hours Miriam stopped to rest and the time it took her to bike the initial 8 miles.
To find the number of hours Miriam stopped to rest, we need to locate the points on the graph where she is not moving. By examining the graph, we can see that there is a period of time between 2 hours and 3 hours where Miriam's position remains constant. This indicates that she stopped to rest during this time. Therefore, Miriam stopped to rest for 1 hour.
Next, we need to find the time it took Miriam to bike the initial 8 miles. By looking at the graph, we can determine that she started at 0 miles and reached 8 miles at approximately 0.25 hours. Therefore, it took Miriam 0.25 hours to bike the initial 8 miles.
Miriam stopped to rest for 1 hour, and it took her 0.25 hours to bike the initial 8 miles. The correct answer is option (c) 1 hour.
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Prove that there is a way to arrange all the dominoes in a cycle respecting the usual rules of the game using graph theory.
Two cards are selected from a standard deck of 52 playing cards. The first is replaced before the second card is selected. Find the probability of selecting a spade and then selecting a jack. The probability of selecting a spade and then selecting a jack is ____ (Round to three decimal places as needed)
The probability of selecting a spade and then selecting a jack is approximately 0.019.
The probability of selecting a spade and then selecting a jack can be calculated as the product of the probability of selecting a spade and the probability of selecting a jack, given that a spade has already been selected on the first draw.
There are 13 spades in a standard deck of 52 playing cards. Thus, the probability of selecting a spade on the first draw is 13/52 or 1/4.
After replacing the first card, the deck is restored to its original composition. Therefore, on the second draw, the probability of selecting a jack (which is one of the four jacks in the deck) is 4/52 or 1/13, as there are 4 jacks in total.
To find the probability of both events occurring, we multiply the probabilities:
P(Spade and Jack) = (1/4) * (1/13) = 1/52 ≈ 0.019 (rounded to three decimal places).
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8. Without dividing the numerator by the denominator, how do you know if 14/28 is a terminating or a non-terminating decimal?
Answer:
terminating
Step-by-step explanation:
A fraction is a terminating decimal if the prime factors of the denominator of the fraction in its lowest form only contain 2s and/or 5s or no prime factors at all. This is the case here, which means that our answer is as follows:
14/28 = terminating