Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Published by Pearson
ISBN 10: 0-32184-874-8
ISBN 13: 978-0-32184-874-1

Chapter 4 - Polynomials - 4.3 Polynomials - 4.3 Exercise Set - Page 253: 89

Answer

3.5 and 8.5 hours.

Work Step by Step

To do this problem, we first draw a horizontal line going through 5 on the concentration axis. Next, we see where this line intersects the curve. Finally, finding the corresponding times to these intersection points, we see that the concentration of 5 mcg/mL occurs at 3.5 and 8.5 hours.
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