Question

Solve the problem.

Sergio's internet provider charges its customers $7 per month plus 3¢ per minute of on-line usage. Sergio received a bill from the provider covering a period and was charged a total of $28.70. How many minutes did he spend on-line during that period? (Round to the nearest whole minute, if necessary.)

Answer 1

He spent about 72 minutes on-line

Answer 2

m = minute

7 + 0.03m = 28.70
-7                  -7

0.03m = 21.70
/0.03        /0.03

m = 723.33 or 723 minutes of time online.

723 minutes = 12 hours 3.3 minutes