Question

Michael purchased a prepaid phone card for $30.25. Calls cost 25 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. How much credit is left on the card after Michael uses it for minutes of calls (in dollars)?

Answer 1

The amount of credit left on the prepaid phone card can be calculated using the formula C = $30.25 - 0.25x, where C represents the credit left on the card, and x represents the number of minutes of calls made.

Step-by-step explanation:

To determine the amount of credit left on the prepaid phone card, we can use the formula: C = $30.25 - 0.25x, where C represents the credit left on the card, and x represents the number of minutes of calls made.

We can substitute the value of x into the formula to find the credit left on the card.

For example, if Michael uses the card for 10 minutes of calls, the calculation would be:

C = $30.25 - 0.25(10) = $30.25 - $2.50 = $27.75.

Therefore, after using it for 10 minutes of calls, Michael would have $27.75 left on the card.