Answer:
Option C, 36 degrees
Step-by-step explanation:
Step 1: Make an Equation since 4x and x are supplementary, that means that they add up to 180 degrees.
4x + x = 180
Step 2: Solve for x
4x + x = 180
5x / 5 = 180 / 5
x = 36
Answer: Option C, 36 degrees
