题目
英文的导数数学题,
(1 pt) The total cost (in dollars) of producing coffee machines is
C(x)=1900+70x-0.7x^2
(A) Find the exact cost of producing the 21st machine.
Exact cost of 21st machine =
(B) Use marginal cost to approximate the cost of producing the 21st machine.
Approx.cost of 21st machine =
(1 pt) The total cost (in dollars) of producing coffee machines is
C(x)=1900+70x-0.7x^2
(A) Find the exact cost of producing the 21st machine.
Exact cost of 21st machine =
(B) Use marginal cost to approximate the cost of producing the 21st machine.
Approx.cost of 21st machine =
提问时间：2021-03-25
答案
(A)
Exact cost of 21st machine = C(21)-C(20)=3161.3-3120=41.3
(B)
MC(x)=70-1.4x
Approx.cost of 21st machine =MC(20)=70-1.4×20=42
Exact cost of 21st machine = C(21)-C(20)=3161.3-3120=41.3
(B)
MC(x)=70-1.4x
Approx.cost of 21st machine =MC(20)=70-1.4×20=42
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