How do you create zero pairs using algebra tiles?
Add a positive unit tile to a negative unit tile.
Add a positive unit tile to a positive unit tile.
Add a negative x-tile to a negative x-tile.
Add a negative x-tile to a positive unit tile.

Giuseppi's pizza had orders for $931.00 of pizzas. the prices were $21 for a large pizza, 514 for a medium pizza, and $7 for a small pizza. the number of large pizzas was two less than four times the number of medium pizzas. thenumber of small pizzas was three more than three times the number of medium pizzas. how many of each size of pizza were ordered?

What is the perimeter of a rectangular building that is 80 feet wide and 140 feet deep?

The radius of a sphere is 3 inches. which represents the volume of the sphere?