Answer
$\frac{x^{4}}{y^{2}}$
Work Step by Step
We are given the expression $\frac{y^{-2}}{x^{-4}}$.
$\frac{y^{-2}}{x^{-4}}=\frac{x^{4}}{y^{2}}$
In general, $x^{−b}=\frac{1}{x^{b}}$ and $\frac{1}{x^{-b}}=x^{b}$, for some number x.
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