The geometric mean of 2 positive numbers is the square root of their product of the 2 numbers. what is the geometric mean of 4 and 49

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?

Can someone check if i did this correct. it’s number 4 if you’re wondering.

What is always true when two whole numbers are subtracted?