Find COS B. round to 2 decimal places. PLS HELP. will award brainliest

Answer:
Step-by-step explanation:
Cos is a/h so first we need the length of CB to get the adjacent value.
12^2 + b^2 = 30^2
144 + b^2 = 900
b^2 = 756
b = 27.4954 or 27.5
cos of 27.5/30 = 0.9998 or 1