Question

Aldo purchased a prepaid phone card for $45.75. 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 function.
C(x)=45.75-0.07x
How much credit is left on the card after Aldo uses it for 20 minutes of calls?

Answer 1

Answer: 44.35

Explanation:

0.07x20=1.4

45.75-1.4

Answer 2

Answer is $44.35 credit left on the card

Step by step

C(x) = 45.75 - .07x

x = 20 minutes

C(x) = 45.75 - (.07) (20)

C(x) = 45.75 - 1.40 = $44.35 left on the card