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3 years ago

The perimeter of a square is represented by 20n-8. Write an expression that will represent each side of the square.

Mathematics

2 answers:

Over [174]3 years ago

5 0

Answer:

n=3

Step-by-step explanation:

20+20+20 length +width+ height

20×3

Fynjy0 [20]3 years ago

4 0

(20n-8) / 4
5n-2 is the answer

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NikAS [45]

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First we find the average $\bar{x}$ of the 9 data:

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The formula of the standard deviation $\sigma$ is:

$\sigma=\sqrt{\frac{\sum_{x=1}^{n}(x_{i}-\bar{x})^{2}}{n}}$

We replace the data and find the value of the standard deviation:

$\sigma=\sqrt{\frac{(1-12)^{2}+(2-12)^{2}+(11-12)^{2}+(8-12)^{2}+(16-12)^{2}+(16-12)^{2}+(20-12)^{2}+(16-12)^{2}+(18-12)^{2}}{9}}$

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4 years ago