Answer
$4mn^5$
Work Step by Step
We rewrite the given expression as a division problem: $4m\div n^{-5}$
The negative exponent rule states that for every nonzero number $a$ and integer $n$, $a^{-n}=\frac{1}{a^n}$. We use this rule to rewrite the expression:
$4m\div\frac{1}{n^5}$
To divide by a fraction, we multiply by the reciprocal: $4m\times\frac{n^5}{1}$
We simplify: $4mn^5$
