1. Cost function is C(q) =25+3q^2. What is marginal cost at q = 5 ?

2. If the production of an additional unit raises total cost by more than the previous unit, the marginal cost of that unit must be increasing.

True or False.

3. Average total cost is ATC(q) = (100/q)+q. What is marginal cost at q = 25? (Hint: First multiply by q to obtain total cost.)

4. Cost function is C(q) = 72 + 2q^2. At what value of q does the marginal cost curve intersect average total cost curve? Recall from your introductory microeconomics class that the marginal cost curve intersects the the average total cost curve at the minimum of average total cost.