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nevsk [136]
3 years ago
9

Alaska,Hawaii,Washington have active volcanoes. Alaska has 43,Hawaii has 5,and Washington has v. If hey have 52 active volcanoes

in all, how many volcanoes does Washington have?
Mathematics
1 answer:
Nitella [24]3 years ago
3 0
Simple. Add the number of volcanoes from Alaska and Hawaii.
43+5=48
Then subtract that number from the total volcanoes.
52-48=4
Washington has 4 volcanoes
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Korolek [52]

Answer:

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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

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The margin of error is given by:

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In this question, we have that:

\pi = 0.21

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So \alpha = 0.1, z is the value of Z that has a pvalue of 1 - \frac{0.1}{2} = 0.95, so Z = 1.645.

How large a sample would be required in order to estimate the fraction of tenth graders reading at or below the eighth grade level at the 90% confidence level with an error of at most 0.03

We need a sample of n, which is found when M = 0.03. So

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

0.03 = 1.645\sqrt{\frac{0.21*0.79}{n}}

0.03\sqrt{n} = 1.645\sqrt{0.21*0.79}

\sqrt{n} = \frac{1.645\sqrt{0.21*0.79}}{0.03}

(\sqrt{n})^2 = (\frac{1.645\sqrt{0.21*0.79}}{0.03})^2

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A sample of 499 is needed.

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2 years ago
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11111nata11111 [884]

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Step-by-step explanation:

Since the triangles are equal, the bottom length of triangle CAD will be the same as the bottom length of BAD. This means that the total length of the bottom of triangle ABC is 6 (3 + 3).

Next, you need to find the length of AC and again, since they're the same triangle, AB will be the same as AC, 14.

The three side lengths of the triangle will be 6, 14, and 14, so the perimeter is

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12 five dollar bills and 18 ten dollar bills

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