All natural (counting) numbers are a subset of integers true or false

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

Arecipe uses 2 cups of sugar to make 32 brownies. how many cups of sugar are needed to make 72 brownies?

The height of a flare fired from the deck of a ship in distress can be modeled by h(t)= -2(8t^2-52t-28), where h is the height of the flare above water and t is the time in seconds. a. find the time it takes the flare to hit the water.