Is each of the following statements true or false? In either case, briefly justify your answer. (a) If a firm has economies of scale, then its average cost is decreasing and lower than its marginal cost. (b) A firm whose total cost function is C(Q)=Q^2+Q must have economies of scale. (c) A firm with total cost function ?(Q) = 3Q+2 must have constant returns to scale. Plz do fast asap

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