Construct and simplify a sum approximating the area above the x-axis and under the curve y = x² between x = 0 and x = 3 by using n rectangles having equal widths and tops lying under or on the curve. Find the actual area as a suitable limit. Select one: a. C. 3(n+1)(2n+1) n² b. 9(n+1)(2n+1) 2n² e. area = 6 square units , area = 9 square units -, area = 6 square units , area = 9 square units 3(n-1)(2n-1) n² d. 9(n-1)(2n-1) 2n² 9(n-1) 2n area 9 square units

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