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: 36


$6$ cents per minute

Work Step by Step

For a 10 minute call, the cost is $60$ cents. For a 30 minute call, the cost was $180$ cents. The increase in cost is: $=180-60=120$ cents The difference in time is: $=30-10=20$ minutes Thus, the average rate is: $=\dfrac{120\text{ cents}}{20 \text{ minutes}}=6$ cents per minute
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