A contour map is shown for a function f on the square R = [0,4]*[0,4]. Assume a = 2, b = 4, C = 2, d = 4, e = 10, f = 0,9 = 0, h = 10,1 = 20, j = 30, k = 10,1 = 20, m = 30. y b m c (a) Use the Midpoint Rule with m = n = 2 to estimate the value of the following. S] 112.3}da The value of integral is (b) Estimate the average value of f.