QUICK WILL GIVE BRAINLIEST!!!!!!!!Question is in the picture!
Answer and Step-by-step explanation:
The angle will always add up to 180.
a = 100
b = 42
c = 29
x = 9
100 + 42 = 142 + 29 = 171 + 9 = 180
Please Mark Brainliest! have a great day! :D