The answer is 15.92
This comes from the use of any of the trig functions, but you want to pick whichever one fits best. Since we are given the angle 53 degrees and the adjacent side that measures 12, and we want to find the opposite side, we can simply enter these values into our trig function.
Tan(53deg) = x / 12
Tan(53deg) * 12 = x
1.32704482 * 12 = x
x = 15.92454
