this is Calculus

Your mathematical work must accurately support your final answer. Correct answers receive NO CREDIT without mathematically correct supporting work. NO CREDIT for decimal representations of numbers. (13 points) Use Riemann sums to estimate the area under the graph of y = a2 on [0, 6). Use right endpoints with three rectangles (n = 3). (3 points) Correct graph of function on the xy-plane with x-axis correctly labeled. (2 points) Computation of Ax. (4 points) Numberline with beginning point, ending point, and all gridpoints. (3 points) Computation of area for the three rectangles. (1 point) The estimation