OK we have a right angle A and we're interested in angle B.
Relative to B, AB=7 is the adjacent side and AC=17 is the opposite side so we have:
[tex]\tan B = \dfrac{\textrm{opp}}{\textrm{adj}} = \dfrac{17}{7}[/tex]
[tex]B = \arctan \frac{17}{7} \approx 67.62 ^\circ[/tex]
Answer: 68
