Can someone explain how to do this? I’m sort of lost.

Answer:
12.37 inched for 75 degree turn
Step-by-step explanation:
the circumference of the pulley is 9.35 x 2 x 3.14 = 58.718 inches.
That's 58.718 inches for 360 degrees.
58.718/360 = 0.1631 inched per degree
0.1631 x 75° 50' = 12.37 inches for 75° 50' degree turn