The angles below are supplementary. What is the value of x?
A pair of supplementary angles is shown. One angle measures 4x plus 20 degrees, and the other angle measures 40 degrees.
5
7.5
30
15
30
Explanation:
Supplementary angles add up to 180 degrees. Setting up an equation:
4x + 20 + 40 = 180
4x + 60 = 180
4x = 120
x = 30