Answer:
x = 15, 45 degree angle
Explanation:
2x + 15 and 6x - 45 adds up to 90 degrees
(2x + 15) + (6x - 45) = 90
combine like terms:
2x + 6x = 8x
15 + (-45) = -30
8x - 30 = 90
8x - 30 + 30 = 90 + 30
8x = 120
8x / 8 = 120 / 8
x = 15
2(15) + 15
30 + 15 = 45 degree angle
6(15) - 45
90 - 45 = 45