For the function given below, find a formula for the Riemann sum obtained by dividing the interval [0,4] into n equal subintervals and using the right-hand endpoint for each c. Then take a limit of this sum as n - co to calculate the area under the curve over [0,4]. f ( x ) = x- +3 Write a formula for a Riemann sum for the function f(x) = x + 3 over the interval [0,4]- Sn = (Type an expression using n as the variable.) The area under the curve over [0,4] is | square units. (Simplify your answer.)