Answer
$\frac{s^{2}}{r^{5}}$
Work Step by Step
We know that $a^{−n}=\frac{1}{a^{n}}$ and $\frac{1}{a^{-n}}=a^{n}$ (as long as a is a nonzero real number and n is an integer).
Therefore, $\frac{r^{-5}}{s^{-2}}=\frac{1}{r^{5}}\times s^{2}=\frac{s^{2}}{r^{5}}$.