SOLUTION: Jessica purchased a prepaid phone card for $35.00. Calls cost cents a minute using this card. The credit, C (in dollars), left on the card after it is used for x minutes of call

Algebra ->  Customizable Word Problem Solvers  -> Finance -> SOLUTION: Jessica purchased a prepaid phone card for $35.00. Calls cost cents a minute using this card. The credit, C (in dollars), left on the card after it is used for x minutes of call      Log On

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Question 1199616: Jessica purchased a prepaid phone card for $35.00. Calls cost cents a minute using this card. The credit, C (in dollars), left on the card after it is used for x minutes of calls is given by the following function.
How much credit is left on the card after Jessica uses it for 15 minutes of calls?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Somethings are missing. Calls cost WHAT per minute? WHAT following function?

Helping anyway, | prepaid phone card for $35.00. Calls cost r cents a minute using this card. The credit, C (in dollars), left on the card after it is used for x minutes of calls is given by the following function:
C%28x%29=35-%28r%2F100%29x
How much credit is left on the card after Jessica uses it for 15 minutes of calls? |

You need to know the value of r, if you want to find a value.