SOLUTION: Could you please help me! Iam not sure if I done it right with this problem. A cellular phone company offers a contract for which the cost C, in dollars of t mintues of telephoning

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Question 175618: Could you please help me! Iam not sure if I done it right with this problem. A cellular phone company offers a contract for which the cost C, in dollars of t mintues of telephoning is given by C=0.25 (t-500) + 70.85, where it is assumed that + great than 500 mintues. What time will keep cost between $122.95 and $145.70? For the cost to be between $112.95 and $145.70, the telephoning time must be between __ mintues and __mintues.
Answer by solver91311(24713) About Me  (Show Source):
You can put this solution on YOUR website!
C=0.25+%28t-500%29+%2B+70.85

Replace C with 122.95 and then solve for t.

Then replace C with 145.70 and solve for t again.

The two values you get for t will fill in the blanks.