Correct. In vertex form $\displaystyle{y}={a}{{\left({x}-{h}\right)}}^{{2}}+{k}\usepackage{cmbright}\Huge\$ , the vertex of the parabola is given by $\displaystyle{\left({h},{k}\right)}\usepackage{cmbright}\Huge\$ . This means that the vertex of the parabola given by $\displaystyle{h}=-{16}{{\left({t}-{5}\right)}}^{{2}}+{505}\usepackage{cmbright}\Huge\$ is (5, 505), so the height is 505 feet, and the rocket takes 5 seconds to get to that height.