Answer:
90
Step-by-step explanation:
The exterior angle is equal to the sum of the opposite interior angles
9x+9 = 45+5x
Subtract 5x from each side
9x-5x+9 = 45+5x-5x
4x+9 = 45
Subtract 9 from each side
4x+9-9 = 45-9
4x = 36
Divide by 4
4x/4 = 36/4
x = 9
The exterior angle is
9x+9
9*9+9
81+9
90
