A monthly cell phone charge is $45. Each long-distance minute used costs $0.30. The total monthly charge for Sarah’s cell phone bill is $60. Her monthly cell phone cost is represented by the function f(x)=45+0.30xfx=45+0.30x where xx represents the number of long-distance minutes used. If Sarah’s cell phone bill is $60, how many long-distance minutes did she use?

Algebra for College Students
10th Edition
ISBN:9781285195780
Author:Jerome E. Kaufmann, Karen L. Schwitters
Publisher:Jerome E. Kaufmann, Karen L. Schwitters
Chapter8: Functions
Section8.CR: Review Problem Set
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A monthly cell phone charge is $45. Each long-distance minute used costs $0.30. The total monthly charge for Sarah’s cell phone bill is $60. Her monthly cell phone cost is represented by the function f(x)=45+0.30xfx=45+0.30x where xx represents the number of long-distance minutes used. If Sarah’s cell phone bill is $60, how many long-distance minutes did she use?

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