Algebra 1: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281140
ISBN 13: 978-0-13328-114-9

Chapter 3 - Solving Inequalities - 3-3 Solving Inequalities Using Multiplication or Division - Practice and Problem-Solving Exercises - Page 182: 31



Work Step by Step

You can send up to 66 text messages. Work Step by Step Let t be the number of text messages you can send. The cost of the text messages is 0.15 dollars each, or 0.15t. If you can spend no more than 10 dollars, the cost of the text messages must be less than or equal to $10. 0.15t≤10⟶ divide each side by 0.15 0.15t÷0.15≤10÷0.15 t≤66.6 Since it is not possible to send a fraction of a text message and rounding up would make the cost exceed =10 dollars, t≤66.
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