Precalculus: Mathematics for Calculus, 7th Edition

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

Chapter 1 - Section 1.8 - Inequalities - 1.8 Exercises - Page 90: 111

Answer

Plan B is less expensive at over 200 miles.

Work Step by Step

1. Set up your formula for how much each plan costs per day. Plan A: 30+0.10m Plan B: 50 2. Create an inequality. 50$\lt$30+0.10m 3. Simplify. 50$\lt$30+0.10m 20$\lt$0.10m 200$\lt$m or m$\gt$200 This means that Plan A saves money at less than 200 miles, the plans are equal at exactly 200 miles, and Plan B saves money at over 200 miles.
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