At a checkers tournament there where 64 players. it was elimatation tournament. how many games where played before there was a winner

Use the elimination method to solve the system of equations -x+5y=-4 and 4x+3y=16

Determine the mean and variance of the random variable with the following probability mass function. f(x)=( 729divided by 91) (1 divided by 9) superscript x baseline comma x equals 1,2,3 round your answers to three decimal places (e.g. 98.765).

Iknow its nothing to do with education, but what type of thing should i wrote here? ? : ) its for mcdonald's btw.