Answer
$\sqrt[5]{18t^3}$
Work Step by Step
Using $\sqrt[a]{x}\sqrt[a]{y}=\sqrt[a]{xy}$, the given expression, $
\sqrt[5]{9t^2}\sqrt[5]{2t}
,$ simplifies to
\begin{array}{l}\require{cancel}
\sqrt[5]{9t^2(2t)}
\\\\=
\sqrt[5]{18t^3}
.\end{array}