Scott D. answered 10/29/20
Tutor
4.8
(194)
Experienced Physics Tutor with strong Astronomy background
Let a be an angle and c be its complement.
a + c = 90 degrees and a = 2c + 9
substituting: 2c + 9 + c = 90
3c = 90 -9
c = 27 degrees and a = 63 degrees