For a cost function TC = 3Q2+ 7Q +12, MC is : / » Mathematical Economics solved MCQs / By admin Question: For a cost function TC = 3Q2+ 7Q +12, MC is : A. 6Q B. 6Q + 7 C. 3Q + 7 D. undefined Answer» b. 6Q + 7 Note: The above multiple-choice question is for all general and Competitive Exams in India.