SOLUTION: The credit remaining on a phone card (in dollars) is a linear function of the total calling time made with the card (in minutes). The remaining credit after minutes of calls is ,
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Question 892609: The credit remaining on a phone card (in dollars) is a linear function of the total calling time made with the card (in minutes). The remaining credit after minutes of calls is , and the remaining credit after minutes of calls is . What is the remaining credit after minutes of calls?
Found 2 solutions by jim_thompson5910, Theo:
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
The numbers are missing. Please repost the full problem. Thank you.
Answer by Theo(13342) (Show Source): You can put this solution on YOUR website!
the remaining balance in your account for every transaction period is the remaining balance in your account from the previous transaction period minus the cost for this transaction period.
let m = minutes of use.
let c = cost per minute of use.
total cost for the current transaction period is m*c.
this assumes no other costs except the cost for minutes of use.
let b1 = the balance in the account from the previous transaction period.
let b2 = the balance in the account for the current transaction period.
your formula becomes:
b2 = b1 - m*c
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