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: 126


a. $95$ beats per minute b. $114$ beats per minute

Work Step by Step

$a.$ Substitute 30 for a into the formula for the Lower limit: $H=\displaystyle \frac{1}{2}(220-30)=\frac{1}{2}\cdot 190=\frac{190\div 2}{2\div 2}=\frac{95}{1}$ $=95$ beats per minute $b,$ Substitute 30 for a into the formula for the Upper limit: $H=\displaystyle \frac{3}{5}(220-30)=\frac{3}{5}\cdot 190=\frac{3\cdot 190\div 5}{5\div 5}=\frac{3\cdot 38}{1}$ $=114$ beats per minute
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