Answer:
x = 25 degree
Step-by-step explanation:
5x + 4 = 8x - 71 (being vertically opposite angle)
5x - 8x = -71 - 4
-3x = -75
x = -75/-3
x = 25
IDK
1.
0.012, 0.12, 1.2, 12
2.
9.68, 9.7, 9.71, 9.9