Sum of interior angles of a △ = 180°
∴ ∠T + ∠V + ∠U = 180°
⇒ 37° + 63° + X° = 180°
⇒ X° + 100 = 180°
⇒ X° = 180° - 100°
⇒ X° = 80° (D).
Answer:
<h2>4</h2>
Step-by-step explanation:

The question doesn’t make much sense. Do you mean x=50-12? If so, x=38
If you do a check (plug in your answer to y) that would be your reason