Answer
$t$
Work Step by Step
$\bf{\text{Solution Outline:}}$
Use the properties of radicals to simplify the given expression, $
\sqrt[9]{t^9}
.$
$\bf{\text{Solution Details:}}$
Since the index (equal to $9$) is odd, then
\begin{array}{l}\require{cancel}
\sqrt[9]{t^9}
\\\\=
t
.\end{array}