Math 251 Week in Review Sections 13.1-13.3 1. 13.1 Find the Riemann sum for f ( x , y ) 3 xy 2 x 2 1 x 3, 0 y 1 Partition the region into 4 equal rectangles and use the upper right corner of each as an evaluation point. 2. 13.2 Evaluate each iterated integral over the given rectangle. 42 a) 12 xe xy dydx xye b) 11 dydx x sin( c) y 2 0 01 x y 2 xy ) dxdy 0 4 00 21 d) 1 2 2 x y dydx 3. 13.3 Sketch the region and set up f ( x , y ) dA in two orders and evaluate it. R 2 a) f ( x, y ) x y b) f ( x , y ) xe c) f ( x, y ) x 3 y R is the triangle R is bounded R is bounded with veti ces (0,0), (2,4), (0,4). by y x x y 2 2 and y x 2. and x 2y 3 . 4. Sketch the region and reverse the order of integration. 1 2x3 1 x a) 0 x f ( x , y ) dydx b) 3 0 x f ( x , y ) dydx 2 1 1 5. Evaluate x 3 3 sin y dydx 0 x2 6. Find the volume of the region in the first octant between the planes z 2 x 2 y and x y z 6 . Sketch the solid and its projection in the x,y-plane. 2 2 7. Find the volume of the region inside the paraboloid z 9 x y over the triangle with vertices (0,0,0), (3,0,0) and (0,3,0). 2 8. Set up only., the integral to find the volume of the region between the paraboloids z x y 2 2 and z 36 3 x 3 y . 2