Arizona and California are fighting over the right to what?

the correct answer is - ability to find a mate

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)

the second type of galaxy is called a barred spiral, which has a thing called a bar straddling the nucleus

if you look up in the top right corner you'll see your current profile picture, click than click "view profile" you'll be able to change it there.