Answer
See below.
Work Step by Step
$C=180-50-74=56^\circ$.
Using the law of sines, $\frac{a}{\sin50^\circ}=\frac{12}{\sin56^\circ}\\a=\frac{12\sin50^\circ}{\sin56^\circ}\approx11.09$
$\frac{b}{\sin74^\circ}=\frac{12}{\sin56^\circ}\\b=\frac{12\sin74^\circ}{\sin56^\circ}\approx14.0$
