Answer
$y$
Work Step by Step
Using laws of exponents, then,
\begin{array}{l}
y^{4/3}\cdot y^{-1/3}
\\\\=
y^{\frac{4}{3}+\frac{-1}{3}}
\\\\=
y^{\frac{3}{3}}
\\\\=
y
.\end{array}
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