Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 1, Equations and Inequalities - 1.5 Use Problem Solving Strategies and Models - 1.5 Exercises - Problem Solving - Page 39: 28b

Answer

You sent 138 messages.

Work Step by Step

Let x = Text messages y = Monthly bill We will use the equation: $\$40 + 0.10\times x=y$ Plug in the values: $\$40 + 0.10\times x=\$53.8$ $0.10x=\$13.8$ $x=138$ You sent 138 messages.
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