mirco help

Suppose that the long-run total cost function for a firm is. LTC = 10,000Q - 100Q2 + 0.5Q3 a) What is the firm's long run marginal cost (MC) function? Note: You can indicate an exponent (superscript) like this: Q^3 or Q**3 (for Q3) b) At what levels of output will the firm have economies of scale? Explain or justify your