Dan built a deck that is 5 feet long and 5feet wide . He built another deck that is 5 feet long and 7 feet wide . He built a thirt deck that is 5 feet long and 9 feet wide . How do the areas changes?
The areas increase by ten feet squared each time. It goes from 5 to 7 to 9, which is a two number increase each time, which means it would be 5x2, and that's ten.