Question: If the cost function for John's Shoe Repair is C(q) = 100 + 10q - q2 + 13 q3, what is the firm's marginal cost

If the cost function for John's Shoe Repair is C(q) = 100 + 10q - q2 + 13 q3, what is the firm's marginal cost function? What is its profit-maximizing condition if the market price is p? What is its supply curve?

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