Answer
$\frac{1}{y^{2}}$
Work Step by Step
The given expression is
$=y^3\cdot y^{-5}$
Use $a^m\cdot a^n=a^{m+n}$.
$=y^{3-5}$
Simplify.
$=y^{-2}$
Use $a^{-n}=\frac{1}{a^n}$.
$=\frac{1}{y^{2}}$
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