Answer:
Step-by-step explanation:
Exterior angle measure is equal to the sum of non-adjacent interior angles
21..................................................
- 12x + 2 = 9x + 11 + 27
- 12x - 9x = 38 - 2
- 3x = 36
- x = 12
22..................................................
- 13x + 1 = 4x + 6 + 58
- 13x - 4x = 64 - 1
- 9x = 63
- x = 7
