What is the value of m in the diagram?
A.
20o
B.
30o
C.
40o
D.
50o
Correct answer is B
4m - 15o = m + 75o
(Vertically opposite angles are equal)
4m - m = 75 + 15
3m = 90
m = \(\frac{90}{3}\)
m = 30o