Find the Exact Value of the Expression Using the Provided $\sin ( s + t )$

Find the exact value of the expression using the provided information.
-Find $\sin ( s + t )$ given that $\cos s = - \frac { 5 } { 13 }$ , with $s$ in quadrant II, and $\sin t = \frac { 15 } { 17 }$ , with $t$ in quadrant II.

A) $\frac { 21 } { 221 }$
B) $- \frac { 21 } { 221 }$
C) $- \frac { 171 } { 221 }$
D) $\frac { 171 } { 221 }$

Correct Answer:

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