Solve the system of equations.
x + 3y = −1
2x + 2y = 6
(−4, 1)
(2, −1)
(4, −1)
(5, −2)

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

Asocial networking site currently has 400,000 active members, and that figure is predicted to increase by 32% each year. the following expression represents the number of active members on the site after t years.

Your food costs are $5,500. your total food sales are $11,000. what percent of your food sales do the food costs represent?