You found $\displaystyle{{\csc{{50}}}}^{\circ}\usepackage{cmbright}\Huge\$ . Remember that secant is the reciprocal of cosine, not sine. Use your calculator to find $\displaystyle{{\cos{{50}}}}^{\circ}\approx{0.6427876097}\usepackage{cmbright}\Huge\$ . Then find the reciprocal of this and round off.