SOLUTION: OOPPPSS! I no i said the last one was my last one but I cam across another one that I do not understand how to do correctly. Can you please help it is a word problem? A cellula

Question 144142: OOPPPSS! I no i said the last one was my last one but I cam across another one that I do not understand how to do correctly. Can you please help it is a word problem?
A cellular phone company offers a contract for which the cost C, in dollars, of t minutes of telephoning is given by C=0.25(t-400) + 44.95 where it is assumed that t>_400 minutes. What times will keep cost between $91.20 and $114.70.
HELP PLEASE!!!
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Start with the given equation

Set the right side greater than or equal to than the lower endpoint, but less than or equal to the higher endpoint

Distribute

Combine like terms

Add 55.05 to all sides

Divide all sides by 0.25 to isolate t

So if the time is between 585 and 679 minutes, then the cost will be between $91.20 and $114.70.
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