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3 years ago

~!¡! Congruent and Similar Polygons !¡!~ ~! Please help me out !~

Mathematics

1 answer:

fomenos3 years ago

3 0

Answer:

why u gotta spread rumors?

Step-by-step explanation:

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What is the answer to -11+1/3x+9=7

artcher [175]

The answer is C that is X=27

view the picture for step by step solution

7 0

3 years ago

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An automobile manufacturer would like to know what proportion of its customers are not satisfied by the service provided by the

zheka24 [161]

Answer:

The sample size needed if the margin of error of the confidence interval is to be about 0.04 is 18.

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:

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

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 $Z = 1.96$ .

Past studies suggest this proportion will be about 0.15

This means that $p = 0.15$

Find the sample size needed if the margin of error of the confidence interval is to be about 0.04

This is n when M = 0.04. So

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

$0.04 = 1.96\sqrt{\frac{0.15*0.85}{n}}$

$0.04\sqrt{n} = 1.96\sqrt{0.15*0.85}$

$\sqrt{n} = \frac{1.96\sqrt{0.15*0.85}}{0.04}$

$(\sqrt{n})^{2} = (\frac{1.96\sqrt{0.15*0.85}}{0.04})^{2}$

$n = 17.5$

Rounding up

The sample size needed if the margin of error of the confidence interval is to be about 0.04 is 18.

8 0

3 years ago

Y=-5x + 30

jasenka [17]

Rewrite Equations
x=10; y=−5x+30

Step: Solve x=10
for x: x=10

Step: Substitute
10 for x in y=−5x+30:
y=−5x+30
y=(−5)(10)+30

y=−20
(Simplify both sides of the equation)
Answer: x=10 y=-20 (10,-20)

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3 years ago

Can somebody plz help answer these questions correctly! Thx (grade7math) btw :)

mestny [16]

A) 14:10 = 7:15
b) 8:5
c) 5:10 = 1:2
d) 8 + 14 + 5 + 10 + 5 = 42
14:42 = 7:21 = 1:3

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3 years ago

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Your digital camera printer printed 5 pictures in 7.5 minutes. At, this rate, how long will it take to print 18 pictures?

qwelly [4]

It would take 27 minutes to print 18 pictures

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3 years ago