SOLUTION: [ Anna is in a phone booth with 1.35 dollars in change. A call home costs 60 cents for the first five minutes and 15 cents for each additional minute. How long can she talk? ]
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Question 825590: [ Anna is in a phone booth with 1.35 dollars in change. A call home costs 60 cents for the first five minutes and 15 cents for each additional minute. How long can she talk? ]
You can put this solution on YOUR website! ---
c = 15t + 60
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interpretation of the equation: c = 15t + 60
c is the cost to talk for (t+5) minutes, where t is the talking-time in minutes
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c - 60 = 15t
t = (c - 60)/15
t = (135 - 60)/15
t = 5 minutes
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from the definition:
c (135 cents in this case), is the cost to talk for (t+5) minutes
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answer:
she can talk for a total of (t+5) or 10 minutes
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