For the function given below, find a formula for the Riemann sum obtained by dividing the interval [0, 30] into n equal subintervals and using the right-hand endpoint for each ck. Then take a limit of this sum as n â oo to calculate the area under the curve over [0, 301 f(x) = 900-X Which of the following expressions gives the formula for the Riemann sum for the function f(x)-900-X over the interval [0, 30)? 2 2 OA. 27,000 6n 6n 2 D. 27,000- 27,000 OC. 27,000 6n 6n