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.

http://i233.photobucket.com/albums/e...isChan7/dm.png

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- May 25th 2011, 04:26 PMRedonYellowUse 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.

http://i233.photobucket.com/albums/e...isChan7/dm.png - May 25th 2011, 04:32 PMTKHunny
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?