SOLUTION: I have a math project for school and it involves finding the equations of the following companies' data. I know how to graph these and the equations for each part of each graph; ho

Question 187327: I have a math project for school and it involves finding the equations of the following companies' data. I know how to graph these and the equations for each part of each graph; however, I don't know how to find an equation that will take into account the change in cost per minute. Thanks for any help!
Here is the data:
Company A: $30 fee, 10 cents a minute for the first 300 minutes, then 8 cents a minute after that.
Company B: No fee, 25 cents a minute for 200 minutes, 10 cents a minute for the next 500 minutes then 5 cents a minute.
Company C: $50 flat fee for the first 500 minutes, then 10 cents per minute.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
find an equation that will take into account the change in cost per minute. Thanks for any help!
Here is the data:
Company A: $30 fee, 10 cents a minute for the first 300 minutes, then 8 cents a minute after that.
Cost = 3000 + 10x for 0300
-----------------------------------------------------------
Company B: No fee, 25 cents a minute for 200 minutes, 10 cents a minute for the next 500 minutes then 5 cents a minute.
Cost = 25x for 0 < x <=200 or 10x for 200< x <=500 or 5x for x > 500
------------------------------------------------------------

Company C: $50 flat fee for the first 500 minutes, then 10 cents per minute.
Cost 50 for 0 < x <= 500 or 10x for x> 500
======================================================
Cheers,
Stan H.

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