onless specified, all approximating rectangles are assumed to have the same width. Let f(x) = X (a) Estimate the area under the graph of f, the x-axis, and the lines x = 1 and x = 2 using four approximating rectangles and right endpoints. (Round your answer to four decimal places.) X Sketch the graph and the rectangles. X 1 2 1 y 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. 1 1 2 1 y Is your estimate an underestimate or an overestimate of the true area? O underestimate O overestimate 1 1 X 1 2 1 2 1 2 1 1 2 1 2 1 2 X