Answer
$y^{10}$
Work Step by Step
Using $a^{m/n}=\sqrt[n]{a^m}=(\sqrt[n]{a})^m$, the given expression, $
\sqrt[4]{y^{40}}
,$ is equivalent to
\begin{array}{l}\require{cancel}
y^{40/4}
\\\\=
y^{10}
.\end{array}
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