Incorrect. Remember that $\displaystyle{{4}}^{{x}}{{4}}^{{y}}={{4}}^{{{x}+{y}}}\usepackage{cmbright}\Huge\$ and $\displaystyle{{\left({{4}}^{{a}}\right)}}^{{b}}={{4}}^{{{a}{b}}}\usepackage{cmbright}\Huge\$ . Substitute $\displaystyle{{4}}^{{3}}\usepackage{cmbright}\Huge\$ in for 64 and simplify the expression.