The cost curve facing a firm is
TC(Q)=3Q²+8Q+192
where:
Q is the number of units produced per time period.
TC is cost of production in dollars
At Q = 4,
1) 5 > Slope of Average Cost > 0; Marginal Cost - Average Cost < 10
2) Slope of Average Cost < -10; Average Cost - Marginal Cost > 40
3) -10
4) Slope of Average Cost > 5; Marginal Cost - Average Cost > 10
Please give me the full solution.