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6.3.35 Question Help Use a Riemann sum to approximate the area under the graph of f(x) = 3 e -* on the interval 0s xs 1 using n = 5 subintervals with the selected points as the right end points. The area is approximately |units. (Round to six decimal places as needed.)6.3.38 Question Help Use a Riemann sum to approximate the area under the graph of f(x) (shown In which graph below are the selected points the left end points of the 4 below) on the interval 0 S x $ 4 using n = 4 subintervals with the selected points as approximationg rectangles? the left end points. Draw the approximationg rectangles. O A. O B. Ay Ay Ay 8- 6- 4- X 02468 02468 2- O c. O D. Ay Ay ONa X 02468 024686.3.33 Question Help a Use a Riemann sum to approximate the area under the graph of f(x) = 3x" on the interval 2 s x$ 4 using n =5 subintervals with the selected points as the left end points. The area is approximately . (Type an integer or a decimal.)6.3.42 Question Help Approximate the area under the curve f(x) = 4x + 5 and above the x-axis on the interval 2 s x $ 6 using rectangles whose height is the value of the function at the left endpoints of the rectangle using four rectangles. The approximate area is (Simplify your answer.)6.3.43 Question Help The graph of the function f(x) = 116 -x on the interval - 4 Sx$4 is a semicircle. The area under the graph is , x(4) = 25.13274, to y= 1 16-x2 five decimal places. Use a Riemann sum with n = 4 and midpoints to estimate the area under the graph. Then compute the error (the difference between the estimate and 25.13274). The estimated area under the graph is (Type an integer or a decimal rounded to five decimal places as needed.)