Answer:
40
Step-by-step explanation:
Use the Outside Angles Theorem,

C is the answer yeah yeah
-4 (x - 5) + 3 (a - 7)
First, expand your problem. / Your problem should look like: -4x + 20 + 3a - 21
Second, simplify. / Your problem should look like: -4x + 3a - 1
Answer: -4x + 3a - 1 (C)
Look for the one with Parallel diagonals