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Question 979939: "A person buys a phone for $86 and signs up for a single-line phone plan with 2000 monthly anytime minutes. The plan costs $116.98 per month. Write an equation that can be used to determine the total cost, C(t), of this phone plan for t months." My question is, how do I come up with the formula again?! I'm reviewing for my midterm tomorrow, and this is only chapter one! Help!
Thanks in advance,
Anonymous
Answer by jim_thompson5910(35256)   (Show Source):
You can put this solution on YOUR website! t = number of months
C(t) = total cost at t months
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The phone costs $86. This is the fixed cost.
The plan costs $116.98 per month. This is the variable cost.
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Total Cost = (variable cost)*(number of months) + (fixed cost)
C(t) = (116.98)*(t) + (86)
C(t) = 116.98t + 86
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The total cost equation/function is C(t) = 116.98t + 86
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