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8) A farmer finds that if she plants 85 trees per acre, each tree will yield...

8) A farmer finds that if she plants 85 trees per acre, each tree will yield 70 bushels of fruit. She estimates that for each additional tree planted per acre, the yield of each tree will decrease by 4 bushels. How many trees should she plant per acre to maximize her harvest?

? trees

9) A company's revenue from selling x units of an item is given as R=2000x−3x2. If sales are increasing at the rate of 55 units per day, how rapidly is revenue increasing (in dollars per day) when 150 units have been sold?

? dollars per day

Give your answer rounded to the nearest whole number.

Math   Calculus   
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