There are 64 players in a chess tournament. After each round, half of the players are eliminated. How many rounds must be played until the players reach the semifinals with four players left?
Write an equation to represent the situation. Then solve the equation.

Four individuals pool money together to start a new business and agree to split the profits equally. n invests $6,000, x invests $2,000, y invests $8,000 and z invests $4,000. if the profits for the first month were $100,000, y receives than if the profits were divided in proportion to how much they invested.

Aregular pentagon with a perimeter of 21 inches is dilated by a scale factor of 5/3 to create a new pentagon. what is the perimeter of the new pentagon?

What number is 7 units left of -15?