1 Relationships between functions The function of the total product is given as follows: 0. = 48L + 4L2 - 1/3L3. 3) Using total variable, derive graphically and numerically a marginal and average variable b) Using an adequate graph, explain the relationship between the total, average and marginal variable. c) Find the extrems of the functions AP, MP and TP. d) Which amount of labour results in diminishing returns