Answer:
x = 8°
Step-by-step explanation:
The exterior angle is equal to the two opposite angles added together.
(34°) + (11x + 9)° = (15x + 11)°
34° + 11x + 9° = 15x + 11°
34° + 9° + 11x = 15x + 11°
43° + 11x = 15x + 11°
32° + 11x = 15x
32° = 4x
8° = x
x = 8°
