Trigonometry 7th Edition

Published by Cengage Learning
ISBN 10: 1111826854
ISBN 13: 978-1-11182-685-7

Appendix A - Section A.1 - Introduction to Functions - A.1 Problem Set - Page 488: 60

Answer

See below.

Work Step by Step

Plugging in $t=4$ we get: $s(4)=\frac{60}{4}=15$, this means that if it takes $4$ minutes to run a mile, her average speed will be $15$ mph. Plugging in $t=5$ we get: $s(5)=\frac{60}{5}=12$, this means that if it takes $5$ minutes to run a mile, her average speed will be $12$ mph.
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