Calculus

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Consider a manufacturer whose total cost of producing x items is given by c(x)=10000+5x+1/9x^2.
a. What is the average cost function A(x)= c(x)/x?
b. How many items should the manufacturer produce in order to minimize average cost?
c. What is the smallest average cost?
d. Find C’(x).
e. When does C(x) have a critical point? What is the average cost when C(x) has a critical point?

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