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.

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) (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
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