On itv's homework hotline, it's time for "rudolf's rules." if you guess what rule rudolf is using you get a prize. someone puts golf balls into a miniature-golf display called rudolf, then rudolf sends back a certain number of golf balls. today rudolf gets 8 balls and sends back 6. next rudolf gets 15 and sends back 27. when he gets 25, 57 are returned. if n represents the number of balls initially given to rudolf, write an expression to represent how many balls he sent back.