16) (2n^-2)/(3p^-3) 18) (4ab^-2)/(-3c^-2) 20) (w(xy)^-2)/((3tv)^-2) 22) ((2)/(5))^-2 24) ((5x)/(3yz))^-3

16) $\frac {2n^{-2}}{3p^{-3}} = \frac {2}{3} \cdot n^{-2} \cdot p^{3} = \frac {2p^{3}}{3n^{2}}$<br /><br />18) $\frac {4ab^{-2}}{-3c^{-2}} = \frac {4a}{-3} \cdot b^{-2} \cdot c^{2} = -\frac {4ac^{2}}{3b^{2}}$<br /><br />20) $\frac {w(xy)^{-2}}{(3tv)^{-2}} = w \cdot (xy)^{-2} \cdot (3tv)^{2} = \frac {9t^{2}v^{2}}{w(xy)^{2}}$<br /><br />22) $(\frac {2}{5})^{-2} = (\frac {5}{2})^{2} = \frac {25}{4}$<br /><br />24) $(\frac {5x}{3yz})^{-3} = (\frac {3yz}{5x})^{3} = \frac {27y^{3}z^{3}}{125x^{3}}$