Answer:
x = 13.77
Explanation:
They provided two of the angles but I decided to just use B since it has one of its side's length already. So from there you have the angle and they adjacent side length and can use SOHCAHTOA to determine which trig function to use, which is cosine.
cosine = adj/hyp
cos(37) = 11/x
x= 11/cos(37) = 13.77