问题标题:
英文的导数数学题,(1pt)Thetotalcost(indollars)ofproducingcoffeemachinesisC(x)=1900+70x-0.7x^2(A)Findtheexactcostofproducingthe21stmachine.Exactcostof21stmachine=(B)Usemarginalcosttoapproximatethecostofproduci
问题描述:

英文的导数数学题,

(1pt)Thetotalcost(indollars)ofproducingcoffeemachinesis

C(x)=1900+70x-0.7x^2

(A)Findtheexactcostofproducingthe21stmachine.

Exactcostof21stmachine=

(B)Usemarginalcosttoapproximatethecostofproducingthe21stmachine.

Approx.costof21stmachine=

洪在地回答:
  (A)   Exactcostof21stmachine= C(21)-C(20)=3161.3-3120=41.3   (B)   MC(x)=70-1.4x   Approx.costof21stmachine=MC(20)=70-1.4×20=42
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