Homework Help: Algebra

Posted by Norma on Sunday, September 5, 2010 at 11:05pm.

a cellular phone company offers a contract for which the cost C in dollars of t minutes is given by C 0.25 (t-300)+ 61.95 where it is assumed that t¡İ 300 minutes what time will keep $99.45 and 145.95

Algebra - drwls, Monday, September 6, 2010 at 12:28am
Solve 99.45 = 0.25 (t-300)+ 61.95
for time, t

Then repeat the process for
145.95 = 0.25 (t-300)+ 61.95

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