The speed of a baseball pitcher's fastball is 92.4 miles per hour. his fastball is 10% faster than his curveball, and his curveball is 5% faster than his change- up.
part a: how fast is the pitcher's curveball? the choices are a: 84 miles per hour b: 86 miles per hour c: 88 miles per hour d: 90 miles per hour

part b: how fast is the pitcher's change-up? the choices are a: 76 miles per hour b: 78 miles per hour c: 80 miles per hour d: 82 miles per hour