QUESTION #5 A student purchases a mobile phone plan in which she is billed a flat fee of $5.15 per month plus $0.07 per minute for each call up to a total of 400 minutes. a. Write a linear equation that relates the monthly charge C, in dollars, to the number x of minutes used in a month. b. Find the domain of this function. c. Graph this equation. d. What is the monthly charge for using 150 minutes of calls? e. Interpret the slope of the line.

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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QUESTION #5 A student purchases a mobile phone plan in which she is
billed a flat fee of $5.15 per month plus $0.07 per minute for each call up to
a total of 400 minutes.
a. Write a linear equation that relates the monthly charge C, in dollars, to
the number x of minutes used in a month.
b. Find the domain of this function.
c. Graph this equation.
d. What is the monthly charge for using 150 minutes of calls?
e. Interpret the slope of the line.
Transcribed Image Text:QUESTION #5 A student purchases a mobile phone plan in which she is billed a flat fee of $5.15 per month plus $0.07 per minute for each call up to a total of 400 minutes. a. Write a linear equation that relates the monthly charge C, in dollars, to the number x of minutes used in a month. b. Find the domain of this function. c. Graph this equation. d. What is the monthly charge for using 150 minutes of calls? e. Interpret the slope of the line.
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