Answer:
16
Step-by-step explanation:
-1456
-864
4
-11
-5,25
-1,93
31°
3x + 10 = 5x - 4 ... - 3x and +4 both side
14 = 2x
x = 7
angle 1 and angle 2: 5 x 7 - 4 = 31°
check: 3 x 7 + 10 = 31°