SOLUTION: Allegra has a cell-phone plan that charges $55 per month and $0.10 for every minute that she uses the phone beyond what her plan allows. One month, she was billed $58.50 a. Defi

Question 986807: Allegra has a cell-phone plan that charges $55 per month and $0.10 for every minute that she uses the phone beyond what her plan allows. One month, she was billed $58.50
a. Define a variable for the unknown.
b. Write an equation to model the problem.
c. Solve the equation. Show your work.
d. Find the number of minutes that Allegra went over the time that the plan allows

Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
Allegra has a cell-phone plan that charges $55 per month and $0.10 for every minute that she uses the phone beyond what her plan allows.
One month, she was billed $58.50
:
a. Define a variable for the unknown.
let m = no. of minutes over allowed amt
:
b. Write an equation to model the problem.
c. Solve the equation. Show your work.
f(m) = .10m + 55
d. Find the number of minutes that Allegra went over the time that the plan allows
58.50 = .10m + 55
58.50 - 55 =.10m
3.50 = .10m
m = 3.50/.1
m = 35 minutes over allot amt
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