A cell phone company offers aninternational plan by charging $30 for the first 80 minutes, plus$0.50 for each minute over 80.(a) Write a linear model that relates the cost C, in dollars, oftalking x minutes, assuming x ≥ 80.(b) What is the cost of talking 105 minutes? 120 minutes?
A cell phone company offers aninternational plan by charging $30 for the first 80 minutes, plus$0.50 for each minute over 80.(a) Write a linear model that relates the cost C, in dollars, oftalking x minutes, assuming x ≥ 80.(b) What is the cost of talking 105 minutes? 120 minutes?
College Algebra
7th Edition
ISBN:9781305115545
Author:James Stewart, Lothar Redlin, Saleem Watson
Publisher:James Stewart, Lothar Redlin, Saleem Watson
Chapter1: Equations And Graphs
Section1.3: Lines
Problem 92E
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A cell phone company offers an
international plan by charging $30 for the first 80 minutes, plus
$0.50 for each minute over 80.
(a) Write a linear model that relates the cost C, in dollars, of
talking x minutes, assuming x ≥ 80.
(b) What is the cost of talking 105 minutes? 120 minutes?
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