given the total cost TC = 3q²+7q+12, evaluate the marginal cost and average cost if q = 3
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#3q2+7q+12
=3(3)2+7(3)+12
=3(3*2)+7*3+12
=3*9+21+12
=27+21+12
=40
=3(3)2+7(3)+12
=3(3*2)+7*3+12
=3*9+21+12
=27+21+12
=40
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