Estimate the area under the graph of f(x)=2x^(3)+3, from x=-1 to x=4, first using 5 approximating rectangles and right endpoints and then improving your estimate using 10 approximating rectangles and right endpoints. 5 rectangles=? 10 rectangles=? b) repeat part a using left end points 5 rectangles=? 10 rectangles=? c) repeat part a using mid points 5 rectangles=? 10 rectangles=?