Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter P - Section P.1 - Algebraic Expressions, Mathematical Models, and Real Numbers - Exercise Set - Page 18: 130

Answer

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

Work Step by Step

a. H=$\frac{1}{2}$(220-a) a=30 H=$\frac{1}{2}$(220-30) H=$\frac{1}{2}$(190) H=$\frac{190}{2}$ H=95 b. H=$\frac{3}{5}$(220-a) a=30 H=$\frac{3}{5}$(220-30) H=$\frac{3}{5}$(190) H=$\frac{570}{5}$ H=114
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