The area of a circle is 25 in. What is it’s radius?

1 answer:

5 0

$\bf \textit{area of a circle}\\\\
A=\pi r^2~ 
\begin{cases}
r=radius\\
-----\\
A=25
\end{cases}\implies 25=\pi r^2\implies \cfrac{25}{\pi }=r^2
\implies 
\sqrt{\cfrac{25}{\pi }}=r$

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The percentage change of a ratio of two variables is approximately the percentage change in the numerator _____ the percentage c

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Answer:

"The percentage change of a ratio of two variables is approximately the percentage change in the numerator <u>minus</u> the percentage change in the denominator."

Step-by-step explanation:

The percent change in a number is determined by dividing the difference between the new number and original number by the original number and multiplying the result by 100.

Suppose the original ratio of two numbers is: $\frac{25}{100}$ .

And the new ratio is: $\frac{75}{100}$

The percent change is:

$Change\%=\frac{75-25}{100}\times100=\frac{50}{100}\times100=50\%$

Thus, the complete statement is:

"The percentage change of a ratio of two variables is approximately the percentage change in the numerator <u>minus</u> the percentage change in the denominator."

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