A cell phone plan charges $30 per month for unlimited call and text messages, however each gigabyte (GB) of data is charged at a rate of $10 per GB. Assume that fractional values of a GB are prorated according to this rate. If a user uses more than 15 GB of data during their monthly billing cycle, then they are not charged more than the cost for the first 15 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.

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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A cell phone plan charges $30 per month for unlimited call and text messages, however each gigabyte (GB) of data is
charged at a rate of $10 per GB. Assume that fractional values of a GB are prorated according to this rate. If a user uses
more than 15 GB of data during their monthly billing cycle, then they are not charged more than the cost for the first 15 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.
(You may enter the intervals using either interval notation or as an inequality. Do not include the dollar sign in any of your
answers.)
Provide your answer below:
The first piece of C(d) is
defined in the interval
The second piece is
defined in the interval
Transcribed Image Text:A cell phone plan charges $30 per month for unlimited call and text messages, however each gigabyte (GB) of data is charged at a rate of $10 per GB. Assume that fractional values of a GB are prorated according to this rate. If a user uses more than 15 GB of data during their monthly billing cycle, then they are not charged more than the cost for the first 15 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. (You may enter the intervals using either interval notation or as an inequality. Do not include the dollar sign in any of your answers.) Provide your answer below: The first piece of C(d) is defined in the interval The second piece is defined in the interval
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