Profit. Suppose that the cost equation for the company in Problem 85 is C(x) = 830 + 396x (A) Find the local extrema for the profit function. (B) On which intervals is the graph of the profit function...

Profit. Suppose that the cost equation for the company in Problem 85 is C(x) = 830 + 396x (A) Find the local extrema for the profit function. (B) On which intervals is the graph of the profit function concave upward? Concave downward