The cost of producing x ounces of gold from a new gold mine is C = f(x)

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The cost of producing x ounces of gold from a new gold mine is C = f(x) dollars.
(a) What is the meaning of the derivative f'(x)? What are its units?
(b) What does the statement f'(800) = 17 mean?
(c) Do you think the values of f'(x) will increase or decrease in the short term? What about the long term? Explain.
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