The answer is 44.4 hope that helps
You should use a calculator this is very easy, you just add up the things in common and then then divide
#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°
Yes you are right, but just make sure that it's not 32x--32. You can't have two subtraction symbols. Two negatives becomes a positive, so it would be 32x+32