# Chapter 1-4 - Cumulative Review - Page 410: 65

$\frac{81}{625}$m$^{16}$n$^{20}$

#### Work Step by Step

($\frac{3}{5}$m$^4$n$^5$)$^4$ ($\frac{3}{5}$)$^4$m$^{(4\times4)}$n$^{(5\times4)}$ $\frac{3^4}{5^4}$m$^{16}$n$^{20}$ $\frac{3^4}{5^4}$m$^{16}$n$^{20}$ $\frac{81}{625}$m$^{16}$n$^{20}$

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