Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 1 - Section 1.7 - Modeling with Equations - 1.7 Exercises: 22

Answer

The total text messages Miriam sent that month is 1285.

Work Step by Step

10 dollars for the first 1000 text messages and 10 cents for each additional text message, Miriam’s bill for text messages for the month of June is 38.50 dollars, so she has more than 1000 text messages. Let x be the amount of additional text messages, we have: $\frac{10}{100} \times x = 38.50 - 10=28.50$ $0.1x=28.50$, So $x=285$ messages The total text messages Miriam sent that month is $1000+285=1285$.
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