Question: If the cost function for a commodity is C(x) = x3 - 4x2 + 30x + 20 dollars find the marginal cost at x =

If the cost function for a commodity is
C(x) = x3 - 4x2 + 30x + 20 dollars
find the marginal cost at x = 4 units and tell what this predicts about the cost of producing 1 additional unit and 3 additional units.

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