Section 3.4 Exercise For the following exercise the given functions represent the position of a particle traveling along a horizontal line. a. Find the velocity and acceleration functions. b. Determine the time intervals when the object is slowing down or speeding up. 160. The cost function, in dollars, of a company that manufactures food processors is given by C (x) = 200 + + , where x is the number of food processors manufactured. a. Find the marginal cost function. b. Use the marginal cost function to estimate the cost of manufacturing the thirteenth food processor. c. Find the actual cost of manufacturing the thirteenth food processor