# SOLUTION: A cellular phone company offers a contract for which the cost , C, in dollars, of t minutes of telephoning is given by C = .25(t – 600) + 65.95 , where it is assumed that t &#8805

Algebra ->  Algebra  -> Graphs -> SOLUTION: A cellular phone company offers a contract for which the cost , C, in dollars, of t minutes of telephoning is given by C = .25(t – 600) + 65.95 , where it is assumed that t &#8805      Log On

 Ad: Algebrator™ solves your algebra problems and provides step-by-step explanations! Ad: Algebra Solved!™: algebra software solves algebra homework problems with step-by-step help!

 Algebra: Graphs, graphing equations and inequalities Solvers Lessons Answers archive Quiz In Depth

 Click here to see ALL problems on Graphs Question 208197: A cellular phone company offers a contract for which the cost , C, in dollars, of t minutes of telephoning is given by C = .25(t – 600) + 65.95 , where it is assumed that t ≥ 600 minutes. What times will keep costs between \$110.95 and \$145.95? For the cost to be between \$110.95 and \$145.95, the telephoning time must be between ___ minutes and ___ minutes. Thank you, in advance. Your assistance is vey much appreciated.Answer by ankor@dixie-net.com(15645)   (Show Source): You can put this solution on YOUR website!A cellular phone company offers a contract for which the cost , C, in dollars, of t minutes of telephoning is given by C = .25(t – 600) + 65.95 , where it is assumed that t ≥ 600 minutes. What times will keep costs between \$110.95 and \$145.95? : Solve two inequalities .25(t - 600) + 65.95 > 110.95 .25t - 150 + 65.95 > 110.95 .25t - 84.05 > 110.95 .25t > 110.95 + 84.05 .25t > 195 t > t > 780 minutes and .25(t - 600) + 65.95 < 145.95 .25t - 150 + 65.95 < 145.95 .25t - 84.05 < 145.95 .25t < 145.95 + 84.05 .25t < 230 t < t < 920 minutes For the cost to be between \$110.95 and \$145.95, the telephoning time must be between 780 minutes and 920 minutes.