Answer:
x = 32
exterior = 104
Step-by-step explanation:
The exterior angle is equal to the sum of the opposite interior angles
40 + 2x = x+72
Subtract x from each side
40+2x-x = x+72-x
x+40 = 72
Subtract 40 from each side
x+40-40 =72-40
x = 32
The exterior angle
x+72 = 32+72 = 104
