Incorrect. To simplify an expression, reorder the addends and combine like terms. $\displaystyle{3}{{c}}^{{3}}{{d}}^{{2}}\usepackage{cmbright}\Huge\$ , $\displaystyle-{3}{{c}}^{{3}}{{d}}^{{2}}\usepackage{cmbright}\Huge\$ , and $\displaystyle{4}{{c}}^{{3}}{{d}}^{{2}}\usepackage{cmbright}\Huge\$ are like terms. The correct answer is 4.