Note that when the two angles are combined, they form 90°
Solve for x.
5x + 15 + 20 = 90
Simplify. Combine like terms
5x + 35 = 90
Note the equal sign. What you do to one side, you do to the other. Do the opposite of PEMDAS.
Subtract 35 from both sides
5x + 35 (-35) = 90 (-35)
5x = 55
Divide 5 from both sides
5x/5 = 55/5
x = 55/5
x = 11
c. 11 is your answer
hope this helps
~AM
