Question 140587
P(x)= 20x - x^2
a)
20x-x^2=-2400
x^2-20x-2400=0
(x-60)(x+40)=0
x=60
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b) As you can see by the graph below 10 items sold yield the maximum profit.
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c) 20*10-10^2=$100
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Ed
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{{{graph(500,500,-10,30,-125,125,20x-x^2)}}}