Find the Exact Value of the Expression Using the Provided $\tan ( \mathrm { s } + \mathrm { t } )$

Find the exact value of the expression using the provided information.
-Find $\tan ( \mathrm { s } + \mathrm { t } )$ given that $\sin s = \frac { 1 } { 4 }$ , with $s$ in quadrant II, and $\sin t = - \frac { 1 } { 2 }$ , with $t$ in quadrant IV.

A) $\frac { 1 + 3 \sqrt { 5 } } { 8 }$
B) $\frac { 4 \sqrt { 3 } + \sqrt { 15 } } { - 11 }$
C) $\frac { 1 - 3 \sqrt { 5 } } { 8 }$
D) $\frac { 4 \sqrt { 3 } - \sqrt { 15 } } { 11 }$

Correct Answer:

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