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3 years ago

PLS answer ! !!!!!!!!

Mathematics

1 answer:

AveGali [126]3 years ago

5 0

Answer:

no identity will escape! I know where you live

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Which statement is true about the value of the expression below. (-2³)‐² Answer choices: it is less than -1. It is between-1 and

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it is less than -1

Step-by-step explanation:

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3 years ago

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Ghella [55]

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Step-by-step explanation:

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3 years ago

What is the circumference of a circle whose radius is 20 feet? Leave answer in terms of π.

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The circumference of the circle is 40π. Hope it help!

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4 years ago

A researcher wants to estimate the percentage of all adults that have used the Internet to seek pre-purchase information in the

Lubov Fominskaja [6]

Answer:

The required sample size for the new study is 801.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

The margin of error is:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

25% of all adults had used the Internet for such a purpose

This means that $\pi = 0.25$

95% confidence level

So $\alpha = 0.05$ , z is the value of Z that has a pvalue of $1 - \frac{0.05}{2} = 0.975$ , so $Z = 1.96$ .

What is the required sample size for the new study?

This is n for which M = 0.03. So

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$0.03 = 1.96\sqrt{\frac{0.25*0.75)}{n}}$

$0.03\sqrt{n} = 1.96\sqrt{0.25*0.75}$

$\sqrt{n} = \frac{1.96\sqrt{0.25*0.75}}{0.03}$

$(\sqrt{n})^2 = (\frac{1.96\sqrt{0.25*0.75}}{0.03})^2$

$n = 800.3$

Rounding up:

The required sample size for the new study is 801.

4 0

3 years ago

The face of each stone on a walkway was shaped like a trapezoid shown below. 14 inches, 6 inches, 8 inches. What is the area of

marishachu [46]

Answer:

B. 66 square inches

Step-by-step explanation:

Area of a trapezoid = (a + b)/ 2 * h

Where,

a = base a = 14 inches

b = base b = 8 inches

h = height = 6 inches

Area of a trapezoid = (a + b)/ 2 * h

= (14 + 8) / 2 * 6

= 22/2 * 6

= 11 * 6

= 66 inches ²

Area of a trapezoid = 66 inches ²

The correct answer is

B. 66 square inches

8 0

3 years ago