Incorrect. Find the volume of the hemisphere and then subtract the volume of the cone. Because $\displaystyle{d}={30}\usepackage{cmbright}\Huge\$ , $\displaystyle{r}={15}\usepackage{cmbright}\Huge\$ . Also, $\displaystyle{h}={9}\usepackage{cmbright}\Huge\$ for the cone. The formula for the volume of a hemisphere is $\displaystyle{V}=\frac{{1}}{{2}}{\left(\frac{{4}}{{3}}\pi{{r}}^{{3}}\right)}\usepackage{cmbright}\Huge\$ and the formula for the volume of a cone is $\displaystyle\frac{{1}}{{3}}\pi{{r}}^{{2}}{h}\usepackage{cmbright}\Huge\$ . Make sure that you round after you subtract.