Need help on finding left Riemann Sum, Right Riemann and the average of L and R.

Find L, R and their average value for the definite integral using the indicated value of n. 3 4 X + 2 dx, n = 8 Ln= (Round to three decimal places as needed.) Rn = (Round to three decimal places as needed.) The average of Ln and R, is (Round to three decimal places as needed.)