#### Answer

-225

#### Work Step by Step

We follow the instructions and plug -3 in for r and 5 in for s. This leaves us with the expression:
$\frac{-9}{5^{-2}}$
Recall the equation: $a^{-n}= \frac{1}{a^{n}}$. Thus, we put $5^{-2}$ in the numerator of the fraction with a positive exponent. Thus, we find that the expression becomes:
$-9\times5^{2}=-225$