Incorrect. The ladder, wall, and ground form a right triangle with $\displaystyle{a}={5}\usepackage{cmbright}\Huge\$ and $\displaystyle{b}={10}\usepackage{cmbright}\Huge\$ and the length of the ladder is c. Use the Pythagorean Theorem, $\displaystyle{{c}}^{{2}}={{a}}^{{2}}+{{b}}^{{2}}\usepackage{cmbright}\Huge\$ , to solve for c.