Consider the following. xy dA, D is enclosed by the curves y = x, y = 2x Express D as a region of type I. O D = { ( X , y ) | 2 5 x 5 4, x2 s y s 4x} O D = { ( x , y ) | 0 s x s 2, x2 s y s 2x} O D = { ( x , y ) | 0 s x s 2, x2 s y s 2x} O D = { ( X , y ) | 0 s x s y, x2 sys 2} O D = { ( X , y ) | 0 S x 5 4, x2 S y s 4x} Express D as a region of type II. O D = ( x , y ) | 0 s y s 4 , 5 5 x s vy) OD = ( X , y ) 1 0 s y s 2 , 0 s x = 4 ) O D = ( x , y ) 1 0 s y s 2 , + s x s vy) O D = ( X , y ) 1 0 s y s 4 ,