Question 325166: Media Services charges $20 for a phone and $30/month for its economy plan. The equation c=30t+20 describes the total cost, c, of operating a Media Services phone for t months.
The total cost of services for three months is __.
If a customer only has $90 avaiable, how many months of service can she recieve?
a) 2 1/2
b) 2 1/3
c) 2
d) 3
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! Media Services charges $20 for a phone and $30/month for its economy plan. The equation c=30t+20 describes the total cost, c, of operating a Media Services phone for t months.
The total cost of services for three months is
c(3) = 30(3)+20 = 90+20 = 110.
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If a customer only has $90 avaiable, how many months of service can she recieve?
Solve: 90 = 30t+20 for "t":
70 = 30t
t = 7/3 = 2 1/3 months
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Cheers,
Stan H.
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a) 2 1/2
b) 2 1/3
c) 2
d) 3
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