34.8=1/2(10)(b)sin(56)
34.8 = 5bsin(56)
34.8/5 = bsin(56)
6.96 = bsin(56)
6.96/sin(56) = b
8.3952769216 = b
I assume we must round off to the nearest tenths place.
Doing so we get b = 8.40
