Mathematics, 18.09.2019 07:30 22ksotoq

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.)

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sergio's internet provider charges its customers $7 per month plus 3¢ per m...