I'm guessing your trying to figure out your batting percentage so your going to divide 102 by 300 so 102/300 and then your average will come out to .340 (34%) which is a great batting percentage.
Answer:
See below
Step-by-step explanation:
Here is one way .... I showed you how to use Law of cosines in another Q
use this to find CB
CB^2 = 13^2 + 21^2 - 2(13)(21) cos 91 <==== solve for CB
THEN use law of SINES to find angle B
sin B / 21 = sin 91 / CB (CB you found using law of cosines above)
It would be 9/24 which can then be reduced to 3/8.
