Question

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

Answer 1

Part A:

92.4×0.10
= 9.24

92.4−9.24
= 83.16
A

Part B:

83.16×0.05
= 4.158

83.16−4.158
= 79.002

B

The trick to percentages is to put a decimal behind the percent sign and multiply.
So 10% of 10 would be .10 times 10, or 1.
5% of 100 would be .05 times 100, or 5.

Answer 2

The speed of the pitcher's curveball is  84 miles per hours.

The speed of the pitcher's change-up is  80 miles per hours.

What are percentages?

Percentage can be described as a fraction of an amount expressed as a number out of hundred. The sign used to represent percentages is%.

What is the speed of the pitcher's curveball?

The speed of the pitcher's curveball = speed of the fast ball / (100 + 10%)

92.4 / 1.1 = 84 miles per hours

What is the speed of the pitcher's change-up?

the speed of the pitcher's change-up = 84 / 1.05 = 80 miles per hour

To learn more about percentages, please check: https://brainly.com/question/25764815