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Old 10-20-2009, 01:12 PM   #2
Gort
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Join Date: Nov 2005
Posts: 6,648
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at the highest point, the slope = 0 and it's also an inflection point.

y'(x) = slope @ x
y'(x) = 100-4x
y'(x) = 0 = 100-4x, so x = 25.
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