Answer
$\frac{625m^4}{a^{12}}$
Work Step by Step
Applying the rules of exponents:
$(\frac{a^3}{5m})^{-4}$
$=(\frac{5m}{a^3})^4$
$=(\frac{5^4m^4}{a^{12}})$
$=\frac{625m^4}{a^{12}}$
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