Let f ( x ) = 3 + 4 x R a ) estimate the area under the graph of f, the axis, and the lines x = 1 and x = 2 using three rectangles and a right end points Re = Improve your estimate by using 6 rectangles Ro Sketch the curve and approxamiting rectangles for R3 Repeat part a ) using a left endpoints La= L to = Sketch the curve and rectangles for both L 3 * and LG c ) Repeat using mid points