internet plus charges a base fee of $14 each month, and $0.08 per minute.

Question

  for how many minutes did Mark use the internet if he is charged $42 for a month

Answer 1

To find how much Mark gets charged, we know that each minute he uses, he gets billed $0.08.

 

If he uses 't' number of minutes, the company will add $0.08*t to his bill.

 

However, we also know that even if Mark doesn't use any internet at all, he will get billed $14. This means we know that his total bill will be:

 

Bill = $0.08t + $14

 

Since we are looking how many minutes Mark would need to use to receive a bill of $42, we will set the Bill = 42.

 

$42 = $0.08*t + $14

 

$28 = $0.08*t

 

Divide both sides by 0.08

 

t = 350 minutes of internet used for the month.