The management of Thermo Master Company, whose Mexican subsidiary manufactures an indoor-outdoor thermometer, has estimated that the total weekly cost (in dollars) for producing x thermometers is represented by the following function. C(x) = 3400 + 10x Find the average cost function Find the marginal average cost function C Since the marginal average cost function is negative for x > 0, the rate of change of the average cost function is positive for all x > 0. Since the marginal average cost function is positive for x > 0, the rate of change of the average cost function is negative for all x > 0. Since the marginal average cost function is positive for x > 0, the rate of change of the average cost function is positive for all x > 0. Since the marginal average cost function is negative for x > 0, the rate of change of the average cost function is negative for all x > 0