(5x+7) + (8x-21) = 90
13x-14 = 90
13x= 104
X=8
The angle measurements are 47, and 43
3a + b = 54...when b = 9
3a + 9 = 54
3a = 54 - 9
3a = 45
a = 45/3
a = 15 <===
look it up hare
sorry if it's not what your looking for
Answer:I'm 80% sure it is c?!?!
Step-by-step explanation: