Question

Felipe purchased a prepaid phone card for $25.00. Calls cost 7 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.
C=25.00-0.07x
How much credit is left on the card after Felipe uses it for 50 minutes of calls?

Answer 1

To find out how much credit is left on the card after Felipe uses it for 50 minutes of calls, we can substitute x = 50 into the formula:

C = 25.00 - 0.07x

C = 25.00 - 0.07(50)

C = 25.00 - 3.50

C = 21.50

Therefore, there will be $21.50 credit left on the card after Felipe uses it for 50 minutes of calls.

Explanation: