Please answer these questions step by step

Consider the graph of the function 9(23): The graph from :1: = 2 to a: = 6 is a semicircle. Evaluate the following integrals by interpreting them in terms of areas: 2 (a)! 9(23) do: = 0 6 (b)/; 9(23) d2: = 7 (oil 9(3) da: 2 (1 point) Consider the function f (a) = 3 - 9. In this problem you will calculate 9) da by using the definition 3 f(a) da = lim The summation inside the brackets is R, which is the Riemann sum where the sample points are chosen to be the right-hand endpoints of each sub- interval. Calculate Rn for f(x) = - 3 - 9 on the interval [0, 4 and write your answer as a function of n without any summation signs. You will need the summation formulas in Section 5 of your textbook. Rn = lim Rn = n->00