13.3 (option D)
Step-by-step explanation:
angle = 56°
opposite = side opposite the angle = x
adjacent = base = 9
We would apply the trigonomretry ratio SOHCAHTOA
Since we know adjacent and we are looking for the opposite, we would use tan ratio (TOA)
tan 56° = opposite/adjacent
To the nearest tenth, the missing side length x is 13.3 (option D)