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Leokris [45]
2 years ago
9

Pls find 5he area of each rectangle thxs

Mathematics
2 answers:
horsena [70]2 years ago
3 0
(7 cm)*(10 cm) = 70 cm^2

The area is the product of length and width.
Hatshy [7]2 years ago
3 0
Length × width
7×10=70
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How large a sample should be selected to provide a 95% confidence interval with a margin of error of 6? Assume that the populati
marshall27 [118]

Using the z-distribution, it is found that a sample of 171 should be selected.

<h3>What is a z-distribution confidence interval?</h3>

The confidence interval is:

\overline{x} \pm z\frac{\sigma}{\sqrt{n}}

The margin of error is:

M = z\frac{\sigma}{\sqrt{n}}

In which:

  • \overline{x} is the sample mean.
  • z is the critical value.
  • n is the sample size.
  • \sigma is the standard deviation for the population.

For this problem, the parameters are:

z = 1.96, \sigma = 40, M = 6

Hence we solve for n to find the needed sample size.

M = z\frac{\sigma}{\sqrt{n}}

6 = 1.96\frac{40}{\sqrt{n}}

6\sqrt{n} = 40 \times 1.96

\sqrt{n} = \frac{40 \times 1.96}{6}

(\sqrt{n})^2 = \left(\frac{40 \times 1.96}{6}\right)^2

n = 170.7.

Rounding up, a sample of 171 should be selected.

More can be learned about the z-distribution at brainly.com/question/25890103

#SPJ1

4 0
2 years ago
Need help on this if anyone can
Lunna [17]

Answer:

pretty sure it's 15 but if you used my answer and it was wrong srr

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There are (49)5 • 40 books at the library. What is the total number of books at the library? (4 points)
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5 times 40 times 49 equals 9800 because you do 5 time 4 and that's 20 and you add a 0 and you multiply by 49 to get 9800.
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7x+2a=3x+5a

7x-3x = 5a -2a

4x = 3a

x = 3a/4

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HELP asap plz<br><br> Solve 2y^2 – 3y = 2
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Are you solving for x or y?
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3 years ago
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