(1 point) Consider the function f(x)=3x2+9 In this problem you will calculate 04(3x2+9)dx by using the definition abf(x)dx=limn[i=1nf(xi)x] The summation inside the brackets is Rn which is the Riemann sum where the sample points are chosen to be the right-hand endpoints of each subinterval. Calculate Rn for f(x)=3x2+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=