There are 10 red, 2 blue, 3 orange and 3 green marbles in a bag. The probability of choosing a red one first, and without replacing it, choosing a green one second is
(Write your answer as a fraction in simplest form)

What is the smallest integer n such that n\sqrt{2} is greater than 20

The hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?

Tommy buys a sweater that is on sale for 40% off the original price. the expression p -0.4p can be used to find the sale price of the sweater, where p is the original price of the sweater. if the original price of the sweater is 50, what is the sale price?