Incorrect. Remember that $\displaystyle{{5}}^{{x}}{{5}}^{{y}}={{5}}^{{{x}+{y}}}\usepackage{cmbright}\Huge\$ and $\displaystyle{25}={{5}}^{{2}}\usepackage{cmbright}\Huge\$ . Substitute $\displaystyle{{5}}^{{2}}\usepackage{cmbright}\Huge\$ in for 25 and simplify the expression.