Question

John purchased a prepaid phone card for $45.75. Calls cost 10 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=45.75-0.10x
How much credit is left on the card after John uses it for 30 minutes of calls?

Answer 1

Answer: x = 15.25

Explanation:

45.75-0.10x
45.75-(30)0,10x
45.75 - 3x
45.75/3 = x
x = 15.25