please help: (int = integral)

True (T) or False (F)? Let Int(a,b)(f dx) be the integral from a to b of f with respect to x

_____ Int(1,2)(Int(1,2)((xy dx dy)) = Int(1,2)(Int(1,2)(xy dy dx))

_____ Int(1,2)(Int(1,3)(xy^2) dx dy)) = (Int(1,2)( x dx))(Int(1,3)(y^3) dy))

_____ Int(1,2)(Int(1,2)(xy dx dy)) = [Int(1,2)( x dx)]^2

_____ Int(1,2)(Int(1,x)([f(x,y)^2 dx dy]) = Int(1,x)(Int(1,2)[f(x,y)^2 dy dx for any function f(x,y)

_____ For any mass density the center of mass of a spherical ball is at the center of the spherical ball.