SOLUTION: Media Services charges $40 for a phone and $20 a month for its economy plan. Find a model that determines the total cost c(t), of operating a media services phone for t months.

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: Media Services charges $40 for a phone and $20 a month for its economy plan. Find a model that determines the total cost c(t), of operating a media services phone for t months.       Log On


   

Question 230477: Media Services charges $40 for a phone and $20 a month for its economy plan. Find a model that determines the total cost c(t), of operating a media services phone for t months.
(I'm not sure what this is covered under to it is algebra though)
Answer by texttutoring(324) About Me  (Show Source):
You can put this solution on YOUR website!
The $40 is spent on the phone at the start, when t=0. So before any time has passed, you have already spent $40. This represents the y-intercept.
Each month, you have to pay $20. $20/month represents your slope in a graph of Cost vs. Time (in months).
c(t)=20t+40