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(25) Find the area bounded by the curve y = 3x2 + x and the x-axis on the interval [1,3] using a right, left, and midpoint Riemann sum with n = 4 partitions. [26) Given the functions, find the (a) net area and (b) the area of the region bounded by the graph of f and the x-axis on the given interval. Hint: Sketching the graph might be useful. (a) x) = x4 x2; [1.1] (b) f(X)= x2 x ;[0,3] (2 7) Find the area ofthe region bounded by the graph of f and the x-axis on the given interval. (a) f(x) = 16 x2; [2,4] (b) f(x) = x3 x; [1,4]