I would need help with these to understand.

2 a: The rectangles in the graph below illustrate a left endpoint Riemann sum for it) = g on the interval [4,8]. The value of this left endpoint Riemann sum is C], and this Riemann sum is [5e|ect an answer] v the area of the region enclosed by y = f(:v) , the x-axis' and the vertical lines x = 4 and x = 8. Left endpoint Riemann sum for y = 3% on [4, 8] The rectangles in the graph below illustrate a right endpoint Riemann sum for f () = 2 2 8 on the interval [4, 8]. The value of this right endpoint Riemann sum is and this Riemann sum is [select an answer] the area of the region enclosed by y = f(), the x-axis, and the vertical lines x = 4 and X = 8. CO 7 6 5 4 2 1 1 2 3 5 6 7 8 Right endpoint Riemann sum for y = - on |4, 8]The rectangles in the graph below illustrate a left endpoint Riemann sum for f(x) = (15/x) on the interval [2, 6]. The value of this left endpoint Riemann sum is , the x-axis, and the vertical lines x = 2 and x = 6. and this Riemann sum is [select an answer] the area of the region enclosed by y = f(a) 8 7 6 5 3 2 1 1 2 3 5 6 7 8 Left endpoint Riemann sum for y = (15 /x ) on [2, 6]The value of this right endpoint Riemann sum is The rectangles in the graph below illustrate a right endpoint Riemann sum for f(a) = (15/x) on the interval [2, 6]. y = f(a), the x-axis, and the vertical lines x = 2 and x = 6. ,and this Riemann sum is [select an answer] the area of the region enclosed by y 8 7 6 5 4 3 2 1 2 3 5 6 7 8 Right endpoint Riemann sum for y = (15 /x) on [2, 6](A) Estimate the area under the graph of an) = 16 3:2 from a: = 0 to :1: = 4 using 4 approximating rectangles and right endpoints. Estimate = C] (B) Repeat part (A) using left endpoints. Estimate = C] (C) Repeat part (A) using midpoints. Estimate = C] Consider the integral (a) Find the Riemann sum for this integral using right endpoints and n = 4. C] (b) Find the Riemann sum for this same integral, using left endpoints and n = 4 C]