How do you solve this using special right triangle this is geometry

Hello from MrBillDoesMath!
Answer:
11.1
Discussion:
cos(42) = x / 15 => multiply both sides by 15
x = 15 * cos(42) => as cos(42) = .743 approx
x = 15 * (.743)
x = 11.15
Thank you,
MrB