67°, every triangle equals 180° so add together 35+78 which equals 113. subtract 180-113 and get 67!
The answer is 87 hopes this helps
15a =6a - 90
Move all the numbers with variables to one side
15a - (6a) = 6a -(6a) -90
9a = -90
9a/9 = -90/9
a = -9
Hope this helps
The answer to this question is zero
D- all 4 sided have at least one pair of parallel sides