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 31 minutes of calls is
Algebra.Com
Question 1148636: 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 31 minutes of calls is $16.28, and the remaining credit after 65 minutes of calls is $12.20. What is the remaining credit after 81 minutes of calls?
Answer by greenestamps(13200) (Show Source): You can put this solution on YOUR website!
The additional cost of the additional 34 minutes is $4.08; the cost per minute is $4.08/34 = $0.12.
81 minutes is an additional 16 minutes past 65 minutes; the cost of the additional 16 minutes is 16*$0.12 = $1.92.
The credit remaining after 81 minutes is $12.20 - $1.92 = $10.28.
RELATED QUESTIONS
The credit remaining on a phone card (in dollars) is a linear function of the total... (answered by checkley71,mathslover)
The credit remaining on a phone card (in dollars) is a linear function of the total... (answered by jim_thompson5910)
The credit remaining on a phone card (in dollars) is a linear function of the
total... (answered by josgarithmetic)
The credit remaining on a phone card (in dollars) is a linear function of the total... (answered by jim_thompson5910,Theo)
The credit remaining on a phone card (in dollars) is a linear function of the total... (answered by srinivas.g)
The credit remaining on a phone card (in dollars) is a linear function of the total... (answered by stanbon)
The credit remaining on a phone card (in dollars) is a linear function of the total... (answered by mathmate)
The credit remaining on a phone card (in dollars) is a linear function of the total... (answered by Boreal)
The credit remaining on a phone card (in dollars) is a linear function of the total... (answered by ikleyn)
The credit remaining on a phone card (in dollars) is a linear function of the total... (answered by ikleyn,greenestamps)