#9) 180 - 116 = 64
(3x -13) + ( 2x +4 ) + 64 = 180
5x - 9 + 64 = 180
5x = 180 + 9 - 64
5x = 125
x = 25
#10) 3x - 13
= (3× 25) - 13 = 62
m< A = 62°
