Name_qu Differentials. 1 4 (2, + Ax ) - $(20, ), given 2, = 1 and 2 2 = 4. A ac 2 . Fund dy for each function y = 30+ 12x2 - 20' interest Differential 3. y = f () =202 - 3x +2 2=5, dx = Ax = 0.233. Cost analysis. The total cost (in dollars) of producing x food processors is C(x) = 2,000 + 50x - 0.5x- [A) Find the exact cost of producing the 21st food processor. (B) Use marginal cost to approximate the cost of producing the 21st food processor. 37. Profit analysis. The total profit (in dollars) from the sale of x skateboards is P(x) = 30x - 0.3x- - 250 OS X 100 (A) Find the exact profit from the sale of the 26th skateboard. (B) Use marginal profit to approximate the profit from the sale of the 26th skateboard