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Mathematics 7 Online
OpenStudy (anonymous):

The formula C=80+15(n-4) is used to find the cost, C, of a job in carpentry. The letter m represents the number of master carpenters; h represents the number of helpers. (Note that a master carpenter earns $72 per day and a helper earns $32 per day.) On a certain job, 6 master carpenters are used and 4 helpers are used. The daily labor cost is

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