Question

90°=(11/2*M-30*2)
find M

Answer 1

90° converts to pie/2. Because pie=180°.
Ie 3.141592654/2=1.57
1.57=(11/2*M)-30*2
1.57+15=11/2*M
16.57=11/2*M
16.57*2=11*M
33.14=11*M
3.012=M
Answer M=3.012