how to do this question plz

Answer:
BC = 8.8 cm
Step-by-step explanation:
Use the law of sines.
[tex] \dfrac{\sin A}{a} = \dfrac{\sin B}{b} = \dfrac{\sin C}{c} [/tex]
[tex] \dfrac{\sin 33^\circ}{a} = \dfrac{\sin 112^\circ}{15} [/tex]
[tex] a = \dfrac{15 \sin 33^\circ}{\sin 112^\circ} [/tex]
[tex] a = 8.8 [/tex]
BC = 8.8 cm