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: 129

Answer

a. 140 beats/minute b. 160 beats/minute

Work Step by Step

a. $H=\frac{7}{10}(220-a)$ $ a= 20$ $H=\frac{7}{10}(220-20)=\frac{7}{10}(200)=7\times20=140$ b. $H=\frac{4}{5}(220-a)$ $ a= 20$ $H=\frac{4}{5}(220-20)=\frac{4}{5}(200)=\frac{800}{5}=160$
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.