Hi there!
7. We need to figure out the value of the missing angle and subtract that from 180 to find the exterior angle.
WORK:
180 - 28 - 58 = 94
180 - 94 = 86
? = 86 degrees.
8. First, we need to figure out the value of the missing angle and subtract the value of the missing angle from 180 to find the exterior angle.
WORK:
180 - 35 - 95 = 50
180 - 50 = 130
? = 130 degrees.
9. To solve for x, we need to set the exterior angle equal to its opposite interior angles and solve.
WORK:
8 + 6x = 30 + 4x + 2
2x + 8 = 32
2x = 24
x = 12 degrees
Hope this helps!! :)
If there's anything else that I can help you with, please let me know!