(2 pts.] Find an approximation of the area of the region below the graph of y = VI and over the interval (0, 6], using a Riemann sum with 3 rectangles and right endpoints. (A) 11.727 (B) 6.828 (C) 9.798 (D) 5.864 (E) None of these (2 pts.] To find an antiderivative of f(r) = rIn(r), you've used integration by parts (successfully). Which of the following is the resulting equation? 2 (A) aln(x) - 2 r' dr (B) r' In(x) - 2 12 dx (C) 2 In(x) - 2 r dr (D) (E) None of these 2 In(x) - 2 x dx