4. (25 points) Jerome operates a peach farm in the Niagara region of Ontario under pure competition. Jerome's farm has a cost function given by: c(y) = yz + y + 4 a) What are the value of the fixed costs for Jerome's farm? b) Given the cost function (c(y)) above, what is the expression for average cost, average variable cost, and marginal cost (AC(y), AVC((y), and MC(y))? c) At what level of output is AC(y) at its minimum value? d) What is the value of MC(y) at the output level in c)? e) Is the marginal cost curve upward sloping at all output levels? Explain fully