A star fruit

A star fruit

A star fruit (also known as the carambola) grower finds that if she plants 21 trees per acre, each tree will yield 86 bushels of star fruit. She also estimates that for each additional tree that she plants per acre, the yield of each tree will decrease by 2 bushels. How many trees should she plant per acre to maximize her harvest and what is the maximum harvest?

 

 
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