Which one of these is a polynomial?

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?

The diameter of a circular chip is doubled to use in a new board game. the area of the new chip will be

Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?