For what formula can I use to calculate the average cost?

The management of ThermoMaster 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) : 5500 + 6X (a) Find t e average cost function E. Em = (b) Find t e marginal average cost function E '. C'Of): (c) Interpret your results. 0 Since the margina average cost function is negative for x > O, the rate of change of the average cost function is negative for all x > 0. 0 Since the margina average cost function is positive for x > O, the rate of change of the average cost function is negative for all x > 0. 0 Since the margina average cost function is positive for x > O, the rate of change of the average cost function is positive for all x > 0. 0 Since the margina average cost function is negative for x > O, the rate of change of the average cost function is positive for all x > 0