Manuel purchase a prepaid phone card for $45.00. call of 9 cents in minute using this card.The credit, C (in dollars), left on the card after it used for x minutes of calls is giving by the following.

Question

C=45.00-0.09x
How much credit is left on the card after manuel uses it for 15 minutes of calls?

Answer 1

To find out how much credit is left on the card after 15 minutes of calls, we substitute x = 15 in the equation C = 45.00 - 0.09x:

C = 45.00 - 0.09(15)

C = 45.00 - 1.35

C = <<45.00-1.35=43.65>>43.65

Therefore, there is $43.65 left on the card after Manuel uses it for 15 minutes of calls.