For the function given below, find a formula for the Riemann sum obtained by dividing the interval [a,b] into n equal subintervals and using the right-hand
endpoint for each c. Then take a limit of this sum as n→ ∞o to calculate the area under the curve over [a,b].
f(x) = 4x over the interval [2,6].
Find a formula for the Riemann sum