Answer:
The answer is B.) x = 18
Step-by-step explanation:
A straight angle is 180 degrees.
126 degrees is part of that 180.
And 3x is the other part of the 180 degrees.
180 - 126 = 54
54/3 = 18
x = 18
Hopefully this helps you :)
pls mark brainlest ;)
