For each expression, select all equivalent expressions from the list.

(a) 4(5x-2)

1) 20x-2
2) 20x - 8
3) 9x-2
4) 4.5x-4.2

(b) 8y + 5y + 7y

1) 8y+12y
2) 12y-8y
3) 20y
4) 20+ y