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3 years ago

Please help ASAP 25 pts + brainliest to right/best answer

Mathematics

2 answers:

Lubov Fominskaja [6]3 years ago

5 0

D is the right answer

Whitepunk [10]3 years ago

4 0

The answer seems to be D!!

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Reduce 18/45 to lowest terms

rodikova [14]

18/45 can be divided by nine, so it would be 2/5

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3 years ago

1. Tom is 110 pounds and gains 3 pounds per year. Jerry is 120 pounds and gains 2 pounds per year. Write and solve a system of l

Alenkasestr [34]

Answer:

Step-by-step explanation:

Solve 8-3y<41.

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3 years ago

You want to obtain a sample to estimate a population proportion. At this point in time, you have no reasonable estimate for the

Vesna [10]

Answer:

A sample size of at least 1,353,733 is required.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of , and a confidence level of , 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 .

The margin of error is:

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

98% confidence level

So $\alpha = 0.02$ , z is the value of Z that has a pvalue of $1 - \frac{0.02}{2} = 0.99$ , so $Z = 2.327$ .

You would like to be 98% confident that you esimate is within 0.1% of the true population proportion. How large of a sample size is required?

We need a sample size of at least n.

n is found when M = 0.001.

Since we don't have an estimate for the proportion, we use the worst case scenario, that is $\pi = 0.5$

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

$0.001 = 2.327\sqrt{\frac{0.5*0.5}{n}}$

$0.001\sqrt{n} = 2.327*0.5$

$\sqrt{n} = \frac{2.327*0.5}{0.001}$

$(\sqrt{n})^{2} = (\frac{2.327*0.5}{0.001})^{2}$

$n = 1353732.25$

Rounding up

A sample size of at least 1,353,733 is required.

5 0

3 years ago

2(x+3)-2(x+1)7z=3x-1 <br>which two are possible correct first steps in solving this equation ?

Svet_ta [14]

Step-by-step explanation:

first you do 3×1 get your answer and then × it by 2 then your answer you get you × it by 3 what you get - by 2 what you get you - by 1 and you get your answer hope I helped

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3 years ago

The area of a rectangle is 54 ft?, and the length of the rectangle is 3 ft more than twice the width. Find the dimensions of the

nikklg [1K]

Answer:

prim

Step-by-step explanation:

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3 years ago