## Algebra 1: Common Core (15th Edition)

The answer is $\frac{25}{81}$.
The expression $r^{-4}$$\times$$s^{2}$ can be rewritten as $\frac{s^{2}}{r^{4}}$. We plug in r=-3 and s=5 $\frac{s^{2}}{r^{4}}$. = $\frac{(5)^{2}}{(-3)^{4}}$ = $\frac{25}{81}$.