Find the minimum and maximum turning point for the above equation.

1. The total revenue for a product are related to production, X by:

TR = -x² +14x + 2000

How many units will maximize total revenue?

2. The total cost for a product are related to production, X by:

TC = x³ -12x² + 600

How many units will minimize total cost?

3. The Total cost to produce X unit is

TC = .1x² + 12X +100

Find the Marginal cost of producing 20 units of X

4. The revenue equation for corn production is approximated by

R(x) = .016x²+1.034x+11.39

Where x = number of bushels of corn. Find the marginal revenue for the production of 10 bushels