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From Mathematics: Algebra
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Due on Mar. 01, 2009
Asked on Mar. 02, 2009 at 01:04:24AM

Q:
A cellular phone company offers a contract for which the costC, in dollars, of t minutes of telephoneing is given by c=0.25(t-600)-70.95, where it is assumed that t>_600 minutes. What times will keep costs between $113.20 and 135.20?

For the cost to be between $113.20 and $135.20, the telephoneing time must be between ? minutes and ? minutes.

Bayside Insurance offers two health plans. Under plan A, Giselle would have to pay the first $80 of her ?
medical bills, plus 35% of the rest. Under plan B, she would pay the first $150, but only 25% of the rest. For what amount of medical bills will plan B save her money? Assume she has over $150 in bills.

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Hamptom
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Posted on Mar. 02, 2009 at 01:18:04AM

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Preview: ... > 2 plans: Plan A she pays (P): P=80+.35x Plan B: P=150+.25x These equations give the flat fee she has to pay, plus the percentage of the remainder she must pay. To determine when th ...

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Posted on Mar. 02, 2009 at 01:19:42AM

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Preview: ... formula: 113.20 = 0.25(t-600) - 70.95 184.15 = 0.25(t-600) 736.6 = t - 600 t = 1336.6 So when the cost is 113.20, the time is 1336.6 minutes. ...

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Posted on Mar. 02, 2009 at 01:20:03AM

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Preview: ... Hello, I h ...

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Posted on Mar. 02, 2009 at 01:20:24AM

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Preview: ... 35.20 => 113.20 < 0.25(t-600)-70.95 < 135.20 => 113.20+ 70.95 < .25(t-600) < 135.20 +70.95 => 184.15 < .25(t-600) < 206.15 => 1 ...

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Posted on Mar. 02, 2009 at 01:23:52AM

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Preview: ... 24.6 minutes or ...

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Posted on Mar. 02, 2009 at 01:25:16AM

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Preview: ... similarly if cost c is 135.20 135.20 = 0.25(t-600) -70.95 so 135.20 +70.95 = 0.25t - (0.25)*600 ...

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Posted on Mar. 02, 2009 at 01:31:29AM

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Preview: ... plus 35% of the rest. Under plan B, she would pay the first $150, but only 25% of the rest. For what amount of medical bills will plan B save her money? Ass ...

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Posted on Mar. 02, 2009 at 02:26:26AM

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Preview: ... lo, I have ...

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