Incorrect. Know that in this equation, R represents revenue after costs and earnings have been factored in, and p represents the price. Because revenue is found by multiplying price by demand ( $\displaystyle{R}={p}\cdot{d}\usepackage{cmbright}\Huge\$ ), demand can be found by dividing revenue by price. ( $\displaystyle{d}=\frac{{R}}{{p}}\usepackage{cmbright}\Huge\$ ) Try dividing $\displaystyle-{0.25}{{p}}^{{2}}\usepackage{cmbright}\Huge\$ and $\displaystyle{250}{p}\usepackage{cmbright}\Huge\$ by p.