Question

If 0.13 $÷$ p${}^2$ = 13, then p equals?

• A. 0.01
• B. 0.1
• C. 10
• D. 100
• E. 1000

Answer 1

The correct option is B

0.1

$\frac{0.13}{p^2}=13\iff p^2=\frac{0.13}{13}=\frac{1}{100}\iff p=\sqrt{\frac{1}{100}}=\frac{1}{100}=\frac{1}{10}=0.1$