Question

Dante purchased a prepaid card for $45.25, where calls cost $0.25 a minute. The function representing the credit left on the card after X minutes of calls is given. How much credit is left on the card after it is used for 40 minutes of calls?

a) $35.25
b) $34.25
c) $33.25
d) $32.25

Answer 1

After 40 minutes of calls, there is $35.25 credit left on the card.

Step-by-step explanation:

The function representing the credit left on the card after X minutes of calls is given by:

Credit left = $45.25 - $0.25X

To determine how much credit is left on the card after it is used for 40 minutes of calls, substitute X = 40 into the function:

Credit left = $45.25 - $0.25(40)

Credit left = $45.25 - $10

Credit left = $35.25

Therefore, the correct answer is option a) $35.25.