Question

What is the value of x?

A. x = 32
B. x = 36
C. x = 37
D. x = 40

Can someone explain how to solve this? I keep on getting a smaller number than the answer choices. Thanks!

Answer 1

When we add the angle that has x° and the angle that has (4x-20)° we need to get 180°.

Mathematically: x° + (4x-20)° = 180°.

We solve for x:

x°+4x°-20°=180°, we put all numbers that we know on the right side and all unknowns on the left side:

5x°=200°, we divide by 5 and get:

x=40°

So the correct answer is D. x=40°.