Incorrect. To find the area, substitute $\displaystyle{2}{x}{z}\usepackage{cmbright}\Huge\$ in for l and $\displaystyle{12}{x}{y}{z}\usepackage{cmbright}\Huge\$ in for w in the formula $\displaystyle{A}{r}{e}{a}={l}\cdot{w}\usepackage{cmbright}\Huge\$ . This gives you $\displaystyle{\left({2}{x}{z}\right)}{\left({12}{x}{y}{z}\right)}\usepackage{cmbright}\Huge\$ . What monomial does this simplify to?