SOLUTION: Sprint has a long distance phone plan that charges a monthly fee of $9.99 plus $0.03 per minute. (a) Write down the equation for monthly bill as a function of minutes used.

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Question 139514: Sprint has a long distance phone plan that charges a monthly fee of $9.99 plus $0.03 per minute.
(a) Write down the equation for monthly bill as a function of minutes used.
(b) Identify dependent and independent variables.
(c) Graph the function.
(d) What is the monthly bill if 255 minutes are used for long distance phone calls?
(e) How many minutes were used for long distance if the long distance phone bill was $ 40.50?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Sprint has a long distance phone plan that charges a monthly fee of $9.99 plus $0.03 per minute.
(a) Write down the equation for monthly bill as a function of minutes used.
Bill(x) = 9.99 + 0.03x
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(b) Identify dependent and independent variables.
independent: minutes
dependent: bill
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(c) Graph the function.
graph%28400%2C300%2C-5%2C40%2C-5%2C15%2C9.99%2B0.03x%29
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(d) What is the monthly bill if 255 minutes are used for long distance phone calls?
bill(255) = 9.99+0.03*255=17.64
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(e) How many minutes were used for long distance if the long distance phone bill was $ 40.50?
40.50 = 9.99 + 0.03x
0.03x = 40.50- 9.99
x = 1017 minutes
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Cheers,
Stan H.