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OpenStudy (anonymous):
A plumber earns $40 an hour and the plumber's helper earns $25 an hour. One day the helper starts work at 8 a.m. and the plumber starts at 10 a.m. They both continue working until 4 p.m. The following equations can be used to determine each person's earning, where a represents the amount earned and x represents the number of hours that have passed since 8 a.m. PLUMBER: a = 40(x - 2) HELPER: a = 25 x At what time will the helper and the plumber have earned the same amount of money?
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