math
posted by Kaleia .
Find the average cost function C associated with the following total cost function C.
C(x) = 0.000007x3  0.06x2 + 110x + 76000
C(x) = ??
(a) What is the marginal average cost function C' ?
C'(x) = ??
(b) Compute the following values. (Round your answers to three decimal places.)
C'(5,000) = ??
C'(10,000) = ??

average cost is total divided by quantity:
A(x) = C(x)/x
C'(x) = 0.000021x^2  0.12x + 110