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A cellular phone company offers a contract for which the cost…

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A cellular phone company offers...
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-600) and $80.95, where it is assumed that t> 600 minutes. What times will keep costs between $130.20 and $149.95.
For the cost to be between $130.20 and $149.95, the telephoning time must be between ___ minutes and ____ minutes
Submitted: 8 years ago.Category: Math Homework
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Answered in 3 minutes by:
6/14/2010
Math Tutor or Teacher: abozer,
 replied 8 years ago
abozer
Category: Math Homework
Satisfied Customers: 6,159
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Hi,

130.20 < 0.25(t - 600) < 149.95

520.8 < t - 600 < 599.8

1120.8 < t < 1199.8
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Customer reply replied 8 years ago
I do not understand your answer
Math Tutor or Teacher: abozer,
 replied 8 years ago
Tell me which part do you specifically need more assistance.
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Customer reply replied 8 years ago
What is 1120.8 and 1199.8 in minutes
Math Tutor or Teacher: abozer,
 replied 8 years ago
They are in minutes.
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