A group of 20 people have gotten together to play baseball. They will divide themselves into two teams of 10 players each, with one team wearing green uniforms and the other wearing yellow uniforms. In how many ways can this be done?

Haley buys 9 pounds of apples for $3. how many pounds of apples can she buy for $1?

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.

Cos^2x+cos^2(120°+x)+cos^2(120°-x)i need this asap. pls me