Can someone me asap
what is the difference between the cycling of matter and the transformation of energy

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