# Chapter 9 - Cumulative Review: 7d

$\dfrac{6y^{2}}{7}$

#### Work Step by Step

Using $\dfrac{a^m}{a^n}=a^{m-n}$, then, \begin{array}{l} \dfrac{12y^{10}z^{7}}{14y^8z^7} \\\\ \dfrac{6y^{10-8}z^{7-7}}{7} \\\\ \dfrac{6y^{2}z^{0}}{7} \\\\ \dfrac{6y^{2}}{7} .\end{array}

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