Answer
$10\sqrt[3]{y}$
Work Step by Step
By combining like radicals, the given expression, $
\sqrt[3]{y}+9\sqrt[3]{y}
,$ simplifies to
\begin{array}{l}\require{cancel}
(1+9)\sqrt[3]{y}
\\\\=
10\sqrt[3]{y}
.\end{array}
* Note that it is assumed that all variables represent positive numbers.