A cell phone carrier charges a fixed monthly fee plus a constant rate for each minute used. In January, the total cost for 250 minutes was $55, while in February, the total cost for 150 minutes was $53. Choose the formula below which gives the function C(x) representing the monthly cost, in dollars, of a cell phone using x.

Algebra and Trigonometry (6th Edition)
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ISBN:9780134463216
Author:Robert F. Blitzer
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ChapterP: Prerequisites: Fundamental Concepts Of Algebra
Section: Chapter Questions
Problem 1MCCP: In Exercises 1-25, simplify the given expression or perform the indicated operation (and simplify,...
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A cell phone carrier charges a fixed monthly fee plus a constant rate for each minute used. In January, the total cost for 250 minutes was $55, while in February, the total cost for 150 minutes was $53. Choose the formula below which gives the function C(x) representing the monthly cost, in dollars, of a cell phone using x.

a. C(x) = 0.02x + 50

b. C(x) = -0.02 + 56

c. C(x) = 0.05x + 28

d. C(x) = -0.05 + 78

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