17-25. Double integrals Evaluate each double integral over the region R by converting it to an iterated integral. 17. [ (x (x + 2y) dA; R = {(x,y): 0x 3,1 y 4} 18. [] (x + xy) dA; R = {(x,y): 1 x 2,-1 y |} 1} 19. [[ 4x' cos y dA; R = {(x, y): 1 x 2,0 y m/2} 20. 21. ; [Fa: R= 22. [[ xy sin x dA; R = {(x,y):0 x V/2,0 y 1} [ A; R ex+2y dA; R = {(x, y): 0 x In 2, 1 y In 3} 25 23. dA; R = {(x, y): x 1 y 2} dA; R = {(x, y): 0x 1,1 y 4}