Evaluate the expression for n=60. what does your answer represent

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

You have 12 balloons to blow up for your birthday party. you blow up 1/3, and your friend blows up 5 of them. what fraction of the baloons still need blowing up