Answer
$\frac{25}{m^{18}}$
Work Step by Step
$(5m^{-3})^{2}(m^{4})^{-3}=5^{2}(m^{-3})^{2}(m^{4})^{-3}=25m^{-3\times2}m^{4\times-3}=25m^{-6}m^{-12}=25m^{-6+(-12)}=25m^{-18}=\frac{25}{m^{18}}$
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