Use the figures to calculate the left and right Riemann sums for f on the given f(x) =x +5 f(x) =x +5 O 12- 12- interval and the given value of n. 10- 10- 8- 8- f(x) = x +5 on [2,7]; n = 5 6- 2 6 X 2 X The left Riemann sum is (Simplify your answer.)