Answer
$5x^4y$
Work Step by Step
Using $x^a\cdot x^b=x^{a+b}$, the given expression, $
(-xy)(-5x^3)
,$ simplifies to
\begin{array}{l}\require{cancel}
(-1)(-5)x^{1+3}y^{}
\\\\=
5x^4y
.\end{array}
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