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tankabanditka [31]
3 years ago
9

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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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
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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

So

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:

3 0
3 years ago
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