1. [5 points} Use the Midpoint Rule [page 32D] with the given value of n to approximate the 9f- f2 integral. Round 1your answer to four decimal places. dx , n 4 2. [1t] points each] Find the volume of the solid obtained bv rotating the region bounded by the given curves about the specified axis. State the method you use: disks, washers, or cylindrical shells. Be sure to sketch the region, the solid of revolution, and a typical disk, washer, or shell a. y 2x2 I}, y {1; about thex-axis b. y 23:2 x3,y mahutx 3 3. [it] points] BONUS: Use calculus to find the area of the triangle with the given vertices. First nd the equations of the lines that form the sides of the triangle. Then use integration to find the area. vertices {corners} of the triangle: {[1, -1], {2, 3], {8, D]