Abag contains 5 red marbles, 10 green marbles, and 20 yellow marbles. if teresa takes one marble out of the bag without looking, what is the probability that it is green?

If given an equation of a line such as -1/2x+6 how would you create an equation of a line parallel and perpendicula to this line that goes through another point such as (4,10)

International calls require the use of a country code. many country codes a 3-digit numbers. country codes do not begin with a 0 or 1. there are no restrictions on the second and third digits. how many different 3-digit country codes are possible?

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?