# Chapter 7 - Exponents and Exponential Functions - 7-1 Zero and Negative Exponents - Practice and Problem-Solving Exercises - Page 422: 43

The answer is $\frac{25}{81}$.

#### Work Step by Step

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

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