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 3 - Introduction to Graphing - 3.4 Rates - 3.4 Exercise Set - Page 187: 35

Answer

$12$ cents per minute

Work Step by Step

For a 5 minute call, the cost is $60$ cents. For a 10 minute call, the cost was $120$ cents. The increase in cost is: $=120-60=60$ cents The difference in time is: $=10-5=5$ minutes Thus, the average rate is: $=\dfrac{60\text{ cents}}{5 \text{ minutes}}=12$ cents per minute
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