TC = 100 + 50Q-110Q^2+Q^3 ATC=TC/Q=100/Q+ 50-110Q+Q^2 MC=50-220Q+3Q^2 (Question! how did they get to this equation?

TC = 100 + 50Q-110Q^2+Q^3

ATC=TC/Q=100/Q+ 50-110Q+Q^2

MC=50-220Q+3Q^2 (Question! how did they get to this equation?)