Answers
Answer:
If you just solve normally, you will get x=2 and x=-3. But if you plug these in to check your work, you will find that they are wrong. Your answer is no solution
Step-by-step explanation:
ln(2x+3)+ln(x-2)=ln(x^2-2x)
Rule: log(a) + log(b) = log(a*b)
ln( (2x+3)(x-2) ) = ln(x^2-2x)
Rule: If log(a) = log(b) then a = b
(2x+3)(x-2) = x^2 - 2x
2x^2-x-6=x^2-2x
x^2+x-6=0
Using Quadratic Formula:
x = 2 and x = -3
But, plugging these numbers back into the original equation is false!
Related Questions
Somebody please help me out. How do I find the surface area of a rectangular prism?
Answers
Answer:
A=2(wl+hl+hw)
Step-by-step explanation:
Surface area is the sum of the areas of all faces (or surfaces) on a 3D shape. A cuboid has 6 rectangular faces. To find the surface area of a cuboid, add the areas of all 6 faces. We can also label the length (l), width (w), and height (h) of the prism and use the formula, SA=2lw+2lh+2hw, to find the surface area.
Answer:
Option (C) 198 cm² will be the answer.
Step-by-step explanation:
Surface area of rectangular prism=2(lb+bh+lh)
where l=length, b=breadth and h=height.
Here, the length is 9cm, breadth is 6cm and height is 3cm.
By applying the formula,
2{(9*6)+(6*3)+(9*3)}
2{54+18+27}
2*99
198cm²
y = -9x Proportional or Non Proportional
Answers
Independent random samples of 10 released prisoners in the fraud and 10 released prisoners in the firearms offense categories yielded the given information on time served, in months. At the 1% significance level, do the data
provide sufficient evidence to conclude that the mean time served for fraud is less than that for firearms offenses? Assume the population standard deviations are equal.
Let, be the mean time served for fraud μ_2 the mean time served for firearms offenses. What are the correct hypotheses to test?
A. H_o: μ_1=μ_2
H_a: μ_1>μ_2
B. H_o: μ_1≠μ_2
H_a: μ_1=μ_2
C. H_o: μ_1>μ_2
H_a: μ_1=μ_2
D. H_o: μ_1=μ_2
H_a: μ_1≠μ_2
E. H_o: μ_1<μ_2
H_a: μ_1=μ_2
F. H_o: μ_1=μ_2
H_a: μ_1<μ_2
Compute the test statistic,
t = _______(Round to three decimal places as needed.)
Determine the critical value or values. ______
(Round to three decimal places as needed. Use a comma to separate answers as needed.)
Answers
The correct hypotheses to test is (f) H₀ : μ₁ = μ₂; H₁ : μ₁ < μ₂
The test statistic is undefined
The critical value at α = 0.01 is 2.58
What are the correct hypotheses to test?From the question, we have the following parameters that can be used in our computation:
Mean time served for fraud is less than that for firearms offenses
This means that the hypotheses to test are
H₀ : μ₁ = μ₂
H₁ : μ₁ < μ₂
This is represented with option (f)
Computing the test statisticThe test statistic can be calculated using
z = (x₁/n₁ - x₂/n₂)/√[p(1 - p)/n₁ + p(1 - p)/n₂)
Where p = pooled sample proportion
and p = (x₁ + x₂)/(n₁ + n₂)
The required values are not given
So, the test statistic is undefined
Finding the critical valueGiven that
α = 1%
This means that
α = 0.01
The critical value at α = 0.01 is 2.58
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Prehistoric cave paintings were discovered in a cave in France. the paint contain 25% of the original Carbon-14. Use the exponential decay model for carbon-14, A=A0e^-0.000121t to estimate the age of the paintings
Answers
Answer:
The age of paintings is - 26,601 years .
Step-by-step explanation:
Lets calculate-
A= [tex]0.25 A[/tex]o
Therefore ,
[tex]A= A[/tex]o [tex]e^-^0^.^0^0^0^1^2^1^t[/tex]
[tex]ln0.25=-0.000121t[/tex]
[tex]-3.2188=-0.000121t[/tex]
[tex]t=\frac{-3.2188}{-0.000121}[/tex]
t= 26,601.65
Therefore , the age of paintings is 26,601 years old.
A random variable is normally distributed with a mean of 40 and a standard deviation of 2.5. P(XS 43.75) is:
Answers
A random variable is normally distributed with a mean of 40 and a standard deviation of 2.5. P(XS 43.75) is 0.9332
Given: A random variable is normally distributed with a mean of 40 and a standard deviation of 2.5.
We have to find P(X<43.75).
We have to find the probability of getting a random variable below 43.75 using the normal distribution formula.
Z = (X - μ) / σ
Z = (43.75 - 40) / 2.5
Z = 1.5
The probability of a random variable being less than 43.75 is the same as the probability of a standard normal random variable being less than 1.5.
P(Z < 1.5) = 0.9332 (using the standard normal distribution table)
Thus, the P(X < 43.75) is approximately 0.9332 (to four decimal places).
Hence, the required probability is 0.9332.
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consider the equation below. (if an answer does not exist, enter dne.) f(x) = x3 − 3x2 − 9x 3
Answers
Interval of increase: (-∞, -1) ∪ (3, +∞)
Interval of decrease: (-1, 3)
Given function is f(x) = x³ - 3x² - 9x + 4
Differentiating with respect to x,
f'(x) = 3x² - 6x - 9
f'(x) = 3 (x² - 2x - 3)
f'(x) = 3 (x² - 3x + x - 3)
f'(x) = 3 (x(x - 3) + (x - 3))
f'(x) = 3 (x - 3) (x + 1)
For increasing or decreasing,
f'(x) = 0
3 (x - 3) (x + 1) = 0
x = - 1, 3
In interval (-∞, -1 ), f'(x) = positive,
⇒ f(x) is increasing on (-∞, -1 ),
In interval (-1, 3), f'(x) = negative,
⇒ f(x) is decreasing on (-1, 3),
In interval (3, ∞), f'(x) = positive,
⇒ f(x) is increasing on (3, ∞),
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Given question is incomplete, the complete question is below
Consider the equation below. (If an answer does not exist, enter DNE.) f(x) = x³ - 3x² - 9x + 4 (a) Find the interval on which f is increasing. (Enter your answer using interval notation.) Find the interval on which f is decreasing. (Enter your answer using interval notation.)
Please help asap thank you
Answers
Answer:
1.
Mean:22
Median: 19.5
Mode:12
Range:26
2.
Mean: 21.143
Median: 16
Mode: 5
Range: 43
3.
Mean: 38.5
Median: 37.5
Mode: 13 , 34, 41
Range: 56
4.
Mean: 73.167
Median: 78.5
Mode: 85
Range : 47
5.
Mean: 58.75
Median: 63
Mode: 63
Range : 70
6.
Mean: 68.714
Median: 74
Mode: 74
Range: 57
7.
Mean: 48
47.5
72
66
8.
59.625
61
90
79
9.
31.571
32
46
34
10.
42.111
40
51
51
For each j = N, define the functions fj : [0, 2] → R as ri+1 x = [0, 1], fj(x) = min{1, x³+¹} {2 x = (1,2]. (1) Sketch the graph of the functions fo, f1, and f2.
Answers
The graph of the functions fo, f1, and f2 can be sketched as follows: fo(x) is a constant function equal to 1 on the interval [0, 2]. f1(x) is a piecewise function that equals x³ + 1 on [0, 1] and 1 on (1, 2]. f2(x) is a piecewise function that equals 1 on [0, 1] and 2 on (1, 2].
To sketch the graph of the functions fo, f1, and f2, we consider their definitions and the given intervals.
The function fo(x) is a constant function that equals 1 on the entire interval [0, 2]. Therefore, its graph will be a horizontal line at y = 1 throughout the interval.
The function f1(x) is a piecewise function. On the interval [0, 1], it equals x³ + 1, which means it starts at y = 1 when x = 0 and increases as x moves towards 1. At x = 1, there is a jump discontinuity, and the function becomes a constant 1 for x in (1, 2]. Therefore, the graph of f1 will be a curve increasing from y = 1 to some maximum point between x = 0 and x = 1, and then it remains constant at y = 1 for x in (1, 2].
The function f2(x) is also a piecewise function. On the interval [0, 1], it equals 1, so its graph will be a horizontal line at y = 1. At x = 1, there is another jump discontinuity, and the function becomes a constant 2 for x in (1, 2]. Therefore, the graph of f2 will have a horizontal line at y = 1 on [0, 1] and a horizontal line at y = 2 on (1, 2].
By considering the definitions and intervals, we can sketch the graphs of fo, f1, and f2 as described above.
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Gavin is subdividing land into two plots, where one plot is in the shape of a square and the other plot is in the shape of a rectangle. The square plot of land has a side length of 6x3 feet, and the rectangular plot of land has a length of 3x5 feet and a width of 7x2 feet. Use the properties of exponents to determine the expression that represents the area for each plot of land. Then analyze which plot of land has a larger area if x is 3.
Answers
the lenght of an arc in a circle with diameter 10 inches is 1.25π inches. determine the measure of the arc.
Answers
Answer:
[tex]the \: angle \: is \: 0.25\pi[/tex]
Step-by-step explanation:
the arc length is equal to the radius x angle (in radians)
[tex]s=ra[/tex]
s= arc length, r= radius and a= the angle
solve for a ; a= s/r; a=
[tex]1.25\pi/5[/tex]
The measure of the arc is 0.25π.
Important information:
Diameter of a circle = 10 inches.Length of arc = 1.25πMeasure of arc:The formula for arc length is:
[tex]s=r\theta[/tex]
where s is the arc length, r is the radius and [tex]\theta [/tex] is the measure of arc in radian.
The diameter of a circle is 10 inches. So, the radius is 5 inches.
[tex]1.25\pi=5\theta[/tex]
[tex]\dfrac{1.25\pi}{5}=\theta[/tex]
[tex]0.25\pi=\theta[/tex]
Therefore, the measure of the arc is 0.25π.
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Write an equation for the plane that contains the points (0, -1,3), (2,2,1), and (-3, 2,5) in (a) Point- Normal Form (b) General form (C) Vector form (d) Parametric form
Answers
(a) Point-Normal Form: -11x - 8y - 9z + 45 = 0
(b) General Form: -11x - 8y - 9z + 45 = 0
(c) Vector Form: r = (0, -1, 3) + s(11, 8, 9) + t(0, 0, 1)
(d) Parametric Form: x = 11s, y = -1 + 8s, z = 3 + 9s + t
(a) Point-Normal Form:
To find the equation of a plane in point-normal form, we need a point on the plane and the normal vector to the plane. Let's choose the point (0, -1, 3) from the given points. To find the normal vector, we can take the cross product of two vectors formed by the points.
Vector 1: (2, 2, 1) - (0, -1, 3) = (2, 3, -2)
Vector 2: (-3, 2, 5) - (0, -1, 3) = (-3, 3, 2)
Normal Vector: N = (2, 3, -2) x (-3, 3, 2) = (-11, -8, -9)
Using the point (0, -1, 3) and the normal vector (-11, -8, -9), the equation of the plane in point-normal form is:
-11(x - 0) - 8(y + 1) - 9(z - 3) = 0
(b) General Form:
To write the equation of the plane in general form, we can rearrange the point-normal form equation:
-11x - 8y - 9z + 45 = 0
(c) Vector Form:
The vector form of the equation can be written as:
r = (0, -1, 3) + s(11, 8, 9) + t(0, 0, 1)
(d) Parametric Form:
The parametric form of the equation can be written as:
x = 0 + 11s + 0t
y = -1 + 8s + 0t
z = 3 + 9s + t
Note: In all forms, s and t represent scalar parameters.
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Pamela rides her bike to the park. If she rides at a speed of 12 miles per hour, it
takes her 45 minutes to get to the park. How long will it take her to get to the
park if she rides at a speed of 8 miles per hour? *
Answers
Answer:
well to tell you its easy 4 me
A genetic experiment involving peas yielded one sample offspring consisting of 412 green peas and 125 yellow peas. Use a 0.05 significance level to test the most under the same circumstances, 20% of offspring peas will be yellow. Identify the hypothesis, alternative hypothesis et statistics, P-value, conclusion about the null hypothesis and final conclusion that adds the original claim. Use the P-value method and the normal distribution as an approximation to the binomial distribution.
What are the null and alternative hypotheses?
A H_o: p≠0.26 H_1:p=0.26
B H_o: p≠0.26 H_1:p>0.26
C H_o: p=0.20 H_1:p<0.26
D H_o: p=0.26 H_1:p>0.26
E H_o: p=0.26 H_1:p≠0.26
F H_o: p≠0.20 H_1:p<0.26
What is the test statistic?
z = _______
(Round local places as needed)
What is the P-value?
P-value = _________
Answers
1) the null and alterative hypotheses are - H_o: p=0.20 H_1:p<0.26 (option C)
2)
The test statistic is -2.17.The p -value is 0.0306.What is the explanation for these?
1) The null hypothesis is that the population proportion of yellow peas is equal to 20%. The alternative hypothesis is that the population proportion of yellow peas is less than 20%.
hence, H_o: p=0.20 H_1:p<0.26
2) The test statistic is calculated as follows -
z = (pa - p₀) / √(p₀(1-p₀)/ n)
Where -
pa is the sample proportion of yellow peas (0.25)
p₀ is the hypothesized proportion of yellow peas (0.20)
n is the sample size (537)
The test statistic is -2.17
p- value =P(Z < -2.17)
The p -value is 0.0306.
Since the p-value is less than the significance level of 0.05,we reject the null hypothesis and conclude that there is sufficient evidence to suggest that the population proportion of yellow peas is less than 20%.
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A rectangle field is 3 times as long as it is wide. If the perimeter of the field is 280 yards, what are the fields dimensions
Answers
Length 105 by 35 Width
280/4
70
70*3=210
70*1=70
210/2=105
70/2=35
105 by 35
Sorry if it’s wrong!!
I think this is the right one in comparison to the other person because it’s talking about perimeter.... Idek where they got 10 by 30 from.
The area of that is 300 and the perimeter would be 80 not 280
Which system of equations has only one solution?
A
y=x+5 and y=-3x+6
B
y=x-2 and y=x+4
C
y= |x - 5| and y = 0.2x+1
D
y = x^2-1 and y=1.5x + 1
Answers
Answer:
A
Step-by-step explanation:
option A has two linear equations that intersect at one point
option B has two linear equations that are parallel and do not intersect
option C has one linear equation and an absolute value equation that intersect at two points
option D has one linear equation and a quadratic equation that intersect at two points
i need help on these 2 questions
Answers
2
A = 4.86 yd
b=
h= 1.8 yd
Answers
b= 2.7 yd
The answer is: 2.7yd
The volume ſin cubic feet) of a black cherry tree can be modeled by the equation ý = -51.7+03x_1 + 4.8x_2, where X_1, is the tree's height (in feet) and X_2, is the tree's dameter (in inches). Use the multiple regression equation to predict the y values for the values of the independent variables
(a) x_1 = 72, X_2 = 8.9
(b) x_1 = 65, x_2 = 10.6
(c) x_1 =81, x_2=16.4
(d) x_1 = 88, X_2 = 19.4
Answers
By using the multiple regression equation, the predicted y-values for the values of the given independent variables include the following:
(a) ý = 207.02.
(b) ý = 194.18.
(c) ý = 270.02.
(d) ý = 305.42.
What is a regression line?In Statistics and Mathematics, a regression line simply refers to a statistical line that best describes the behavior of a data set. This ultimately implies that, a regression line refers to a line which best fits a set of data.
Next, we would determine the predicted y-values for the values of the given independent variables as follows;
ý = -51.7+03x₁ + 4.8x₂
(a) x₁ = 72 and x₂ = 8.9
ý = -51.7+03(72) + 4.8(8.9)
ý = 207.02.
(b) x₁ = 65 and x₂ = 10.6
ý = -51.7+03(65) + 4.8(8.9)
ý = 194.18.
(c) x₁ = 81 and x₂ = 16.4
ý = -51.7+03(81) + 4.8(16.4)
ý = 270.02.
(d) x₁ = 88 and x₂ = 19.4
ý = -51.7+03(88) + 4.8(19.4)
ý = 305.42.
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please help me yall, Godbless.
Answers
Answer:
The rate of change or slope is 2
Step-by-step explanation:
Rise over run 2/1
Question 2 (1 point)
Which graph shows the solutions to 2x<6?
Answers
^ because the plot starts on 2, unlike all other choices & it passes 6.
can u help pls like pls
Answers
Answer:
E. 16
Step-by-step explanation:
Easy:
Formula: P=2(l+w)
Plug in and solve:
P=2(3+5)
P = 16 (Option E is correct)
HELP!!! 100 POINTS!!! Find the total surface area of a cylinder with a height of 7 cm and radius of 3 cm. Leave your answer in terms of π.
140π cm2
91π cm2
60π cm2
51π cm2
Answers
Answer:
60π cm2
Step-by-step explanation:
Someone please help really need it.
Write an equation of the line parallel to y = 5x + 7 that passes through the point (-3,2)
Answers
Answer:
y=5x-13
Step-by-step explanation:
Pls help me I’m failing :(
Answers
x + 4 = x + 2
5 = 4
4x = 5x
Infinite solutions:
5 = 5
2(3x + 2) = 6x + 4
7x = 7x
A trinomial with a leading coefficient of 333 and a constant term of -5−5 what is an equation
Answers
Given:
Leading coefficient of a trinomial = 3
Constant term = [tex]-5[/tex]
To find:
The equation of trinomial.
Solution:
If an expression contains three terms, then it is known as trinomial.
The general form of a trinomial which contains leading term and a constant is:
[tex]ax^2+bx+c[/tex]
Where, a,b,c are real non-zero numbers. Here, a is the leading coefficient and c is the constant.
Putting a=3 and c=-5, we get
[tex]3x^2+bx+(-5)[/tex]
[tex]3x^2+bx-5[/tex]
Therefore, the required trinomial is [tex]3x^2+bx-5[/tex], where b is a non zero real number.
Find the area of the trapezoid
Answers
Answer:
42 square units
Step-by-step explanation:
Each square on the grid is 2 units by 2 units.
Bases: OC = 10; SK = 4
Height: OS = 6
area = (b1 + b2)h/2
area = (10 + 4)(6)/2
area = 42
Answer: 42 square units
Answer:
The area of trapezoid is 42 square unit.
Step-by-step explanation:
According to the question
A trapezoid which is consist of many square shapes and each grid square equals 2 units . We need to find the area of trapezoid.
To calculate the area of trapezoid we have given :-
Base ; SK = 4 and OC = 10Height ; OS = 6Formula for finding area of trapezoid is ½ × (Base 1 + Base 2) × Height .Finding the area of trapezoid :-
Area of trapezoid = ½ × ( 4 + 10 ) × 6
Add 4 and 10.Area of trapezoid = ½ × 14 × 6
Multiply 14 by 10.Area of trapezoid = ½ × 84
Divide by 2.Area of trapezoid = 42
Hence,
The area of trapezoid is 42 square unit.
A polygon has vertices at (-1,1), (1,1), (1,-1) & (-1,-1) what is the perimeter in units of the polygon
Answers
Answer:
8
Step-by-step explanation:
Does anybody know both of these answere
Answers
Answer: I do not know
Answer:
A decrease by 14 percent
Step-by-step explanation:
50 - 43 is 7
14 percent of 50 is 7
carter has 37 coins, all nickels and dimes in his piggy bank. The value of the coins is $3.17. How many dimes does carter have?
Answers
Make a system of equations
( n + d = 37 ) 0.05
0.05n + 0.10d = 3.17
0.05n + 0.05d = 1.85
Subtract (elimination method)
0.05d = 1.32, d = 26.4
He has 26 dimes
B
39 m
Use the inverse trigonometric keys
on a calculator to find the measure
of angle A.
А
21 m
с
A=
(Round the answer to the nearest whole number.)
Answers
Answer:
the answer is 20 because you round of 21