Answer:
Explanation:
∠AOB + ∠BOC = ∠AOC
9x +20 + 7x - 6 = 142
9x + 7x + 20 - 6 = 142
Combine like terms,
16x + 14 = 142
Subtract 14 from both sides
16x = 142 - 14
16x = 128
Divide both sides by 16
x = 128/16
x = 8
∠BOc = 7x - 6
= 7*8 - 6
= 56 - 6
= 50