# Chapter 7 - Exponents and Exponential Functions - Chapter Review - Page 475: 15

$\frac{-20}{9}$

#### Work Step by Step

You have the expression $\frac{2x}{y^2 z^-1}$.Since $a^{-b}$=$\frac{1}{a^b}$ our new expression would be $\frac{2xz}{y^2}$.Plug in z=2,y=-3 and z=-5 to evaluate the expression. $\frac{2*2*-5}{(-3)^2}$ -evaluate the exponent- $\frac{2*2*-5}{9}$ -simplify- =$\frac{-20}{9}$

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