Question

me ajudem por favor!!!!!!!!

Answer 1

5a)
a= 180 - 70 = 110
5b)
a = 170 -152 = 18

7)
2/3 x = x-15
2/3x - 3/3x = -15
-1/3 x = -15
x = -15 . -3
x = 65