Answer
$\frac{7x}{y^{4}}$
Work Step by Step
We are given the expression $7xy^{-4}$.
$7\times x\times y^{-4}=7\times x\times\frac{1}{y^{4}}=\frac{7x}{y^{4}}$
In general, $x^{−b}=\frac{1}{x^{b}}$, for some number x.
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