Incorrect. Use that facts that $\displaystyle{{27}}^{{\frac{{5}}{{3}}}}={{\left({{27}}^{{\frac{{1}}{{3}}}}\right)}}^{{5}}\usepackage{cmbright}\Huge\$ and $\displaystyle{{27}}^{{\frac{{1}}{{3}}}}={\sqrt[{{3}}]{{{27}}}}\usepackage{cmbright}\Huge\$ to help you simplify this expression.