Let $x=a+bi$ and $y=c+di$ and $z=f+gi$

Which statements are true? Check all of the boxes that apply.

$x+y=y+x$

$(xy)z=x(yz)$

$x-y=y-x$

$(x+y)+z=x+(y+z)$

$(x-y)-z=x-(y-z)$