Question

Confused by work in screeenshot

Answer 1

b = 12 sqrt(3)

Explanation:

Since we have a right triangle we can use trig functions

cos theta = adjacent side / hypotenuse

cos 30 = b/c

cos 30 = b/24

24 cos 30 =b

24 * sqrt(3)/2 = b

12 sqrt(3) = b