Solve R=M + B, for B.

B = R - M

Step-by-step explanation:

1. R = M + B       Subtract M

2.  R - M = B

For this case, the first thing we should do is use the following trigonometric relationship:
 sine (x) = (C.O) / (h)
 Where,
 x: angle
 C.O: opposite leg.
 h: hypotenuse
 Substituting values:
 sine (27) = (34) / (x)
 Clearing x:
 x = (34) / (sine (27))
 x = 74.89
 
 x = 74.89