The total cost (in dollars) of producing x coffee

发布时间：2021-02-27 22:35:19

The total cost (in dollars) of producing x coffee machines is C(x)=2200+30x−0.8x2.The total cost (in dollars) of producing x coffee machines isC(x)=2200+30x−0.8x2.(A) Find the exact cost o

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A,C21-C20
B,C'(20)
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