Math Problem Statement
A cell phone plan charges $20 per month for unlimited call and text messages, however each gigabyte (GB) of data is charged at a rate of $8 per GB. Assume that fractional values of a GB are prorated according to this rate. If a user uses more than 10 GB of data during their monthly billing cycle, then they are not charged more than the cost for the first 10 GB.
Write a piecewise-defined function that describes the amount a cell phone user will pay, C , as a function of the number of GB of data they use, d , over the course of a month.
Do not include the dollar sign in any of your answers.
Solution
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Math Problem Analysis
Mathematical Concepts
Piecewise Functions
Linear Equations
Inequalities
Formulas
C(d) = 20 + 8d for 0 ≤ d ≤ 10
C(d) = 100 for d > 10
Theorems
-
Suitable Grade Level
Grades 8-10
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