Precalculus (6th Edition) Blitzer

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

Chapter P - Test - Page 147: 61


more than 200 text messages

Work Step by Step

Step 1. Assume the number of text messages is $x$; then Plan B will have a cost of $13+0.06x$. Step 2. For plan A to be better, the cost of plan B needs to be higher than that of plan A. We have $13+0.06x\gt 25$ Step 3. Solving the above inequality, we have $0.06x\gt12$ and $x\gt200$. Thus, for more than 200 text messages, plan A would be better.
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