Introductory Algebra for College Students (7th Edition)

Published by Pearson
ISBN 10: 0-13417-805-X
ISBN 13: 978-0-13417-805-9

Chapter 1 - Section 1.2 - Fractions in Algebra - Exercise Set - Page 31: 128


$a. \displaystyle \quad H=\frac{7}{8}(220-a)$ $b. \quad 175$ beats per minute.

Work Step by Step

$a.$ Based on the form of the formulas in previous exercises, we will subtract the age from 220, and multiply with the wanted factor of heart rate $H=\displaystyle \frac{7}{8}(220-a)$ $b.$ Substitute 20 for a $H=\displaystyle \frac{7}{8}(220-20)=\frac{7\cdot 200}{8}$ ... reduce the fraction with $8$ $= \displaystyle \frac{7\cdot 25}{1}$ $=175$ beats per minute.
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