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Math Help - Use differential to calculate the change in average cost

  1. #1
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    Use differential to calculate the change in average cost

    Can anyone show me how to do this? I got the question wrong, and it is showing me the solution here. I don't know how to get this answer.

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  2. #2
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    C`(x) = (1/5) - 440/x^2

    C`(25)*(31-25)

    C`(45)*(51-45)

    C'(45) -- What's the slope at the starting point.
    (51-45) -- How many horizontal units?
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