Conposite Figures are confusing. Anyone want to help me?

Awrestling tournament begins with 128 competitors. in the first round, each competitor has 1 match against another wrestler. the winner of each match moves on to the next round until there is a winner. write a sequence in which the terms represent the number of players still in the tournament at the end of each round. describe the sequence? how many rounds are in the tournament?

A50% increase followed by 33 1/2% decrease

Why is it so easy to buy on impulse and overspend with a credit card? what could you do to counteract this tendency?