The value of secant is correct, but tangent is not. You need to use the definitions of sine and cosine together with the given values to find the sides of a right triangle that would have those ratios.

A triangle with $\displaystyle{o}{p}{p}={8}\usepackage{cmbright}\Huge\$ , $\displaystyle{h}{y}{p}={17}\usepackage{cmbright}\Huge\$ , and $\displaystyle{a}{d}{j}={15}\usepackage{cmbright}\Huge\$ will have those ratios. Use this information and the definition to find the value of tangent.