Chapter 5 - Section 5.2 - More Work with Exponents and Scientific Notation - Exercise Set - Page 268: 26

$\dfrac{x^{5}y^{10}}{z^{15}}$

Using laws of exponents, the given expression simpifies to \begin{align*} & \left( \dfrac{x^{-1}y^{-2}}{z^{-3}} \right)^{-5} \\\\&= \dfrac{x^{-1(-5)}y^{-2(-5)}}{z^{-3(-5)}} \\\\&= \dfrac{x^{5}y^{10}}{z^{15}} .\end{align*}