sumed to have the same width.' Let f(x) = _. a) Estimate the area under the graph of f, the x-axis, and the lines x = 1 and x = 2 using four approximationg rectangles and right endpoints. (Round your answer to four decimal places.) x Sketch the graph and the rectangles. N O Is your estimate an underestimate or an overestimate of the true area ? underestimate overestimate (b) Repeat part (a) using a left endpoints. (Round your answer to four decimal places.) Sketch the graph and the rectangles . O AO Is your estimate an underestimate or an overestimate of the true area ? O underestimate overestimate