For the function f (x) = x2 + 4x+ 2, estimate R 4 0 f (x) dx using Riemann Sums as directed. (a) Find the left Riemann Sum approximation for R 4 0 f (x) dx with n = 4. Draw the corresponding rectangles on the graph below

b) Find the midpoint Riemann Sum approximation for R 4 0 f (x) dx with n = 2. Draw the corresponding rectangles on the graph below:

Find the right Riemann Sum approximation for R 4 0 f (x) dx with n = 3. Draw the corresponding rectangles on the graph below: