
Concept explainers
Cell Phone Plans Gwendolyn is mulling over the three cell phone plans shown in the table.
From past experience, Gwendolyn knows that she will always use more than 1 GB of cell phone data every month.
(a) Make a table of values that shows the Cost of each plan for 1 GB to 4GB, in 500 MB increments.
(b) Find formulas that give Gwendolyn’s monthly cost for each plan, assuming that she use
(c) What is the charge from each plan when Gwendolyn uses 2.2 GB? 3.7 GB? 4.9 GB?
(d) Use your formulas from part (b) to determine the number of gigabytes of data usage for which:
(i) Plan A and Plan B give the same cost.
(ii) Plan A and Plan C give the same cost.
(iii) Plan B and Plan C give the same cost.

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Chapter P Solutions
College Algebra
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