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: 112

Answer

$0

Work Step by Step

Plan B will be efficient till the sum of monthly fee and actual talk fee is less than $25\$$ Let $t$ be minutes of talk. Plan B will be efficient until the following condition is is true: $0.12t+5 < 25$ $0.12t<20$ $t<166.(6)$ So, the Plan B will be efficient for: $0
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