can anyone expand and simply this for me (3x +2)(2x-5) ?​

The confidence interval at an 80% confidence level is approximately $33.88 to $44.12.

To construct a confidence interval for the mean based on the given survey data, we can use the formula:

Confidence Interval = mean ± (critical value) * (standard deviation / √sample size)

In this case, the mean is $39, the standard deviation is $20, and the sample size is 25. The critical value corresponds to the desired confidence level, which is 80%. To determine the critical value, we can use a standard normal distribution table or a statistical calculator.

For an 80% confidence level, the critical value (z-score) is approximately 1.28.

Now, let's calculate the confidence interval:

Confidence Interval = $39 ± (1.28) * ($20 / √25)

= $39 ± (1.28) * ($20 / 5)

= $39 ± (1.28) * $4

= $39 ± $5.12

This means we can be 80% confident that the true mean amount spent on a child's last birthday gift falls within this range based on the given survey data.

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After 6 million years, 25 percent of the radioactive isotope will be left.

The half-life of a radioactive isotope is the time it takes for half of the initial amount of the isotope to decay. In this case, the half-life is 3 million years. After the first half-life, half of the isotope will remain, which is 50 percent. After another 3 million years (a total of 6 million years), another half-life will have passed. Therefore, half of the remaining 50 percent will decay, leaving 25 percent of the original isotope.

To understand this further, let's consider the decay process. After the first 3 million years, 50 percent of the isotope will have decayed, leaving 50 percent. Then, after the next 3 million years, another 50 percent of the remaining isotope will decay, resulting in 25 percent remaining (50 percent of the original amount). This exponential decay pattern continues as each successive half-life cuts the remaining amount in half.

Therefore, after 6 million years, 25 percent of the radioactive isotope will be left, while 75 percent will have undergone radioactive decay.

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Answer: 126 degrees

there are 360 degrees in a circle.  

Answer:

12.054 < 12.54

Step-by-step explanation:

12.054 is less than 12.54 because it has a zero in the tenths place, and 12.54 has a five in the tenths place! Always check the first spot after the decimal first. Best of luck<3

Answer:

12.054 < 12.54

Step-by-step explanation:

The term of the geometric sequence 1, 3,9, ... which has a value of 19683 is :

To find which term of the geometric sequence has a value of 19683, we can use the formula for the nth term of a geometric sequence.

Here's the formula:

an = a₁ * r^(n - 1)

where an is the nth term of the sequence

a₁ is the first term of the sequence

r is the common ratio of the sequence

Given the sequence 1, 3, 9, ..., we can see that a₁ = 1 and r = 3.

To find the value of n that gives the term with a value of 19683, we can substitute these values into the formula and solve for n:

19683 = 1 * 3^(n - 1)

19683/1 = 3^(n - 1)

3^9 = 3^(n - 1)

Now we can equate the exponents:

9 = n - 1

n = 9 + 1

n = 10

Therefore, the 10th term of the geometric sequence 1, 3, 9, ... has a value of 19683. Thus, the answer is 10.

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The set A, defined as A = {∅} ∪ {⋃_{i=1}^n Ai : n ∈ ℕ, {Ai} ⊆ C, disjoint}, is proven to be an algebra on a set X.

To prove that A is an algebra, we need to show that it satisfies three conditions: (1) X ∈ A, (2) for any set A ∈ A, its complement X\A also belongs to A, and (3) for any sets A, B ∈ A, their union A ∪ B also belongs to A.

First, the empty set ∅ is included in A by definition. Second, let A be any set in A, represented as A = ⋃_{i=1}^n Ai, where {Ai} is a collection of disjoint sets from C. Then, the complement of A is X\A, which can be represented as X\A = ⋃_{i=1}^n (X\Ai). Since each Ai is in C, their complements X\Ai are also in C, implying X\A is a disjoint union of sets from C and therefore belongs to A.

Lastly, let A and B be two sets in A, represented as A = ⋃_{i=1}^n Ai and B = ⋃_{j=1}^m Bj. The union of A and B is A ∪ B = ⋃_{i=1}^n Ai ∪ ⋃_{j=1}^m Bj. Since Ai and Bj are disjoint sets from C, their union Ai ∪ Bj is also in C. Thus, A ∪ B is a disjoint union of sets from C and belongs to A.

By satisfying all three conditions, A is proven to be an algebra on X.

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(A∪B)∩C = {9, 23, 31}.

To find the intersection of the sets (A∪B) and C, we first need to determine the union of sets A and B. The union of two sets consists of all the unique elements present in both sets.

A∪B = {3, 5, 7, 9, 13, 14, 22, 23, 31}

Next, we find the intersection of the obtained union (A∪B) and set C. The intersection of two sets contains the elements that are common to both sets.

(A∪B)∩C = {9, 23, 31}

Therefore, the intersection of the sets (A∪B) and C is {9, 23, 31}. These are the elements that are present in both (A∪B) and C.

In summary, (A∪B)∩C = {9, 23, 31}.

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The 95% confidence interval for p is  (0.47, 0.83)

Total subjects = 40

People preferring fresh brewed = 26

Calculating the sample proportion -

Sample proportion = Number of subjects preferring fresh brewed coffee / Total number of subjects

= 26 / 40

= 0.65

It is required to establish crucial values depending on chosen confidence level in order to generate the confidence interval. The z-value associated with a 97.5% cumulative probability to obtain a 95% confidence range is to be found. This is because the remaining 5% by 2 is divided to determine middle 95% of the standard normal distribution. The z-value for a 97.5% cumulative probability is around 1.96 using Table D or any other approach.

Using the formula for confidence interval -

[tex]CI = p + z x \sqrt ((px (1 - p) / n)[/tex]

Substituting the values -

[tex]CI = 0.65 ± 1.96 \sqrt{x} ((0.65 * (1 - 0.65)) / 40)[/tex]

[tex]= 0.65 ± 1.96 x \sqrt(0.2275 / 40)[/tex]

= 0.65 ± 1.96 x 0.0921

= 0.65 ± 0.1802

Rounding to two decimal places, the 95% confidence interval will be 0.47, 0.83)

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Answer:

Step-by-step explanation:

First, replace f(x) with y . ...

Replace every x with a y and replace every y with an x .

Solve the equation from Step 2 for y . ...

Replace y with f−1(x) f − 1 ( x ) . ...

Verify your work by checking that (f∘f−1)(x)=x ( f ∘ f − 1 ) ( x ) = x and (f−1∘f)(x)=x ( f − 1 ∘ f ) ( x ) = x are both true.

Answer:

D 5.46 x 10^10

Step-by-step explanation:

Recall that  speed is the rate of change of distance with time and may be expressed mathematically as

speed = Distance/time

Distance = speed * time

Hence given that the speed of light

= 3 × 10^8 meters per second

Time taken for light to travel between the given distance

= 1.82 × 10^2 seconds

substituting the given values

Distance = 3 × 10^8 * 1.82 × 10^2

= 5.46 * 10^(8+2)

= 5.46 * 10^10 meters

Answer:

[tex]\angle T = 70[/tex]

Step-by-step explanation:

Given

[tex]\angle T= 2x[/tex]

[tex]\angle S= 75[/tex]

[tex]\angle R= x[/tex]

See attachment for triangle

Required

Calculate [tex]\angle T[/tex]

First, we add up the angles in the triangle;

[tex]\angle R + \angle S + \angle T = 180[/tex]

[tex]x + 75 + 2x = 180[/tex]

Collect like terms

[tex]x + 2x = 180 - 75[/tex]

[tex]3x = 105[/tex]

Solve for x

[tex]x = \frac{105}{3}[/tex]

[tex]x = 35[/tex]

Given that:

[tex]\angle T= 2x[/tex]

[tex]\angle T = 2 * 35[/tex]

[tex]\angle T = 70[/tex]

Answer: 5m

Step-by-step explanation:

The Initial water level means that level amount when the time equal to 0hrs, which is 5m.

Answer:

[tex]x > -\frac{24}{19}[/tex]

Step-by-step explanation:

Given

[tex]\frac{4}{3}x + 4 < \frac{9}{2}x + 8[/tex]

Required

Solve for x

Collect like terms

[tex]\frac{4}{3}x - \frac{9}{2}x < 8-4[/tex]

[tex]\frac{4}{3}x - \frac{9}{2}x < 4[/tex]

Take LCM

[tex]\frac{8x - 27x}{6} < 4[/tex]

[tex]\frac{-19x}{6} < 4[/tex]

Multiply by 6

[tex]6 * \frac{-19x}{6} < 4 * 6[/tex]

[tex]-19x < 24[/tex]

Divide by -19

[tex]x > -\frac{24}{19}[/tex]

Answer:

16.6667% increase

Step-by-step explanation:

Percentage Increase=Final Value−Starting Value|Starting Value|×100  

Answer:

17%

Step-by-step explanation:

The increase is calculated as the difference between yesterday's price and today's price, hence $2.45 - $2.10 = $0.35

As a fraction of yesterday's price, the fraction is [tex]\frac{0.35}{2.10}[/tex], which reduces to [tex]\frac{1}{6}[/tex].  Expressed as a decimal fraction, this is 0.16...  Shift the decimal point two places to the right to get the percentage increase of 16.6...%.

Since it said to round to the nearest tenth, rounding it makes the answer of 17.0% or 17% because since 6 is bigger than 10, we needed to round up and thus the answer is 17%.

Answer:

11.330

Step-by-step explanation:

Answer:

x=11.3

Step-by-step explanation:

Hello There!

We can use trigonometry to solve for x

Remember these are the trigonometric ratios

SOHCAHTOA

Sin = Opposite over Hypotenuse

Cos = Adjacent over Hypotenuse

Tan = Opposite over Adjacent

We can use the angle that has a measure of 31 degrees

We are given the hypotenuse and we need to find its opposite side

hypotenuse and opposite corresponds with sine so we will use sine to create an equation

(remember sin = opposite over hypotenuse)

[tex]sin(31)=\frac{x}{22}[/tex]

now that we have created an equation we solve for x

step 1 multiply each side by 22

[tex]sin(31)*22=22sin(31)\\\frac{x}{22} *22=x\\x=22sin(31)\\sin(31)=0.5150380749\\0.5150380749*22=11.33083765\\x =11.33083765[/tex]

finally we round to the nearest tenth and get that x = 11.3

Answer:

9.07571212

Step-by-step explanation:

To solve this we first need to find the area of the circle, r squared times pi

4 x 4 x pi = 50.2654825

Now we multiply this by 65/360, 50.2654825 x 65/360 = 9.07571212

The shaded sector covers 9.07571212 square inches.

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Answer:

oh thats cool

Step-by-step explanation:

Answer:

its B

Step-by-step explanation:

Answer:

b. data from our experiment

Step-by-step explanation:

Answer:Just add them all

Step-by-step explanation:

Answer:

80

Step-by-step explanation:

First you have to find the percentage of pan crust to all the other crusts to do this you add all the crusts together:

397+220+167+196 = 980

Then divide 196 by 980:

196/980 = .2 or 20%

Then multiply 400 by 20%

400*20% = 80

The coefficients cn are related by the equation:

cn+2 = (n+1)(n+2)cn+1 + (3n-1)cn

To begin, we can substitute the expression for y into the differential equation and see if it satisfies the equation. Taking the first and second derivatives of y with respect to x, we find:

y' = ∑n=0[infinity]cnxn-1

y'' = ∑n=0[infinity]cn(n-1)xn-2

Substituting these expressions into the differential equation yields:

∑n=0[infinity]cn(n-1)xn-2 + (3x-1)∑n

=> 0[infinity]cnxn-1 - ∑n=0[infinity]cnxn+1 = 0

We can rearrange this equation to get:

∑n=0[infinity]cn(n+2)xn+1

=>  ∑n=0[infinity]cn(n-1)xn-2 + (3x-1)∑n=0[infinity]cnxn

Now, we can compare the coefficients of xn+1 on both sides of the equation to get:

cn+2 = (n+1)(n+2)cn+1 + (3n-1)cn

This is a recurrence relation for the coefficients cn. To see how it relates to the equation given in the question, we can substitute n+1 for n and simplify:

cn+3 = (n+2)(n+3)cn+2 + (3n+2)cn+1

Now we can substitute cn+1 from the original recurrence relation:

cn+3 = (n+2)(n+3)(n+1)cn+1 + (n+2)(n+3)cn + (3n+2)cn+1

Simplifying gives:

cn+3 = (n+2)(n+3)cn+2 + [(n+2)(n+3)(n+1) + 3n+2]cn+1

This is exactly the same recurrence relation as the one given in the question. Therefore, we can conclude that the coefficients cn are related by the equation:

cn+2 = (n+1)(n+2)cn+1 + (3n-1)cn

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Answer. it is 5 or letter i

Answer:

The value of x is 5

Step-by-step explanation:

Using the linear pair theorem, both angles are supplementary and add up to 180 degrees. 180 minus 140 is 40. and 8 times 5 = 40. So x = 5.

Answer:

they doubt if they're qualified or not

If kite is on a string that is 18 feet long, then the height of kite is (b) 9 feet.

In order to find the height of the kite, we use trigonometry. We know that the length of the string is 18 feet and the angle with the ground is 30 degrees, we use the Sine function to determine the height of the kite.

The formula to find the height is:

Height = (Length of string) × Sin(Angle),

Substituting the values,

We get,

Height = (18 feet) × Sin(30 degrees),

Using the value of Sine of 30 degrees as (0.5), we can calculate the height as :

Height = (18 feet) × (0.5),

= 9 feet

Therefore, the correct option is (b) 9 feet.

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Answer:

-73

Step-by-step explanation:

-48+6-24-7 = -73

Answer:  So to cover the patio it would take 255 whole tiles.  254.469 if you want to be exact.

Step-by-step explanation:

When finding flooring needed we are finding for area.  We know the formula for finding the area of a circle is A=[tex]\pi r^{2}[/tex] so we plug in our known variables...

we know r because radius is half of diameter and diameter was given in problem.  So half of 18 is 9.

r=9

A=[tex]\pi 9^{2}[/tex]

A=[tex]\pi[/tex]81

A=254.469

The value obtained for SSbetween is 20. The correct answer is (b) 20.

To calculate the sum of squares between (SSbetween) for an analysis of variance (ANOVA), we need to determine the variation between the sample means of the different treatment conditions. The formula for SSbetween is as follows:

SSbetween = n * Σ(M - m)²

where n is the sample size for each treatment condition, M is the individual treatment condition mean, and m is the overall mean.

In this case, the sample size for each treatment condition is n = 10, and the treatment condition means are M1 = 1, M2 = 2, and M3 = 3.

To calculate SSbetween, we first find the overall mean (m) by taking the average of the treatment condition means:

m = (M1 + M2 + M3) / 3

m = (1 + 2 + 3) / 3

m = 6 / 3

m = 2

Now, we can calculate SSbetween:

SSbetween = n * Σ(M - m)²

SSbetween = 10 * [(1 - 2)² + (2 - 2)² + (3 - 2)²]

SSbetween = 10 * [(-1)² + (0)² + (1)²]

SSbetween = 10 * (1 + 0 + 1)

SSbetween = 10 * 2

SSbetween = 20

Therefore, the value obtained for SSbetween is 20. The correct answer is (b) 20.

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Incomplete question:

An independent-measures research study compares three treatment conditions using a sample of n = 10 in each treatment. For this study, the three sample means are M1 = 1, M2 = 2, and M3 = 3. For the ANOVA, what value would be obtained for SSbetween?

a.30

b.20

c.10

d. 2

Answer:

ZX

Step-by-step explanation:

The implicit solution to the initial value problem (2x − 6xy + xy)dx + (1 − 3x^2 + (2 + x^2)y)dy = 0 with y(1) = −4 is given by the equation:3xy − (x + 1)y^2 + 9x^2 = 0. The explicit solution for y as a function of x is given by the formula: y = (-1 + 3x^2 - 7/19 + 8x^2 + x)/(2 + x^2)The numerical value of lim y(x) rounded off to five significant figures is -1.3152.

Intermediate results obtained during the process include: implicit solution of initial value problem and explicit solution for y as a function of x. The implicit solution of the initial value problem is described by the equation:3 xy - (x + 1) y2 + 9 x2 = 0. The explicit solution for y as a function of x is given by the formula: y = (-1 + 3x^2 - 7/19 + 8x^2 + x)/(2 + x^2).

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