Answer
See below.
Work Step by Step
Let $m$ be the spoken minutes, then our inequality is: $25+0.05m\gt5+0.12m\\20\gt0.07m\\\frac{20}{0.07}\approx286\gt m$
Thus it will save money if we speak less than $286$ minutes.
College Algebra 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305115546
ISBN 13:
978-1-30511-554-5
Chapter 1, Equations and Graphs - Section 1.7 - Solving Inequalities - 1.7 Exercises - Page 149: 82
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