Incorrect. The formula for the volume of a cone is $\displaystyle{V}=\frac{{1}}{{3}}\pi{{r}}^{{2}}{h}\usepackage{cmbright}\Huge\$ .

Substitute $\displaystyle{r}={3}\usepackage{cmbright}\Huge\$ and $\displaystyle{h}={7}\usepackage{cmbright}\Huge\$ into the formula. Use $\displaystyle\frac{{22}}{{7}}\usepackage{cmbright}\Huge\$ for $\displaystyle\pi\usepackage{cmbright}\Huge\$ .