please help ASAP

Question 1 (Essay Worth 10 points) (05.01) Using n = 4 equal-width rectangles, approximate x3+8 dx . Use the mid-point of each sub-interval to determine the height of each rectangle.Question 2 (Essay Worth 10 points) [[21 (05.02) Water leaks from a tank at the rate of r(t) gallons per hour. The rate decreased as time passed, and values of the rate at two-hour time intervals are shown in the table below. The total amount of water that leaked out is evaluated by a Riemann sum. Find the upper estimate (left end-points of each rectangle) for the total amount of water that leaked out by using five rectangles. Give your answer with one decimal place. t(hr) O 2 4 6 8 10 r(t)(ga|/hr) 10.7 8.6 6.6 5.2 5.0 4.5 Question 3 (Essay Worth 10 points) (05.03) X Find the interval on which the curve of y = 1 1+t+ +2 dt is concave up.\fEvaluate exactly the value of 2x5 +6x) (5x4 +3)dx . Your work must include the use of substitution and the antiderivative