Question is on the sheet

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

Which graph represents the linear function below? y-3=1/2(x+2)

At a pizza shop 70% of the customers order a pizza 25% of the customers order a salad and 15% of the customers order both a pizza and a salad if s customer is chosen at random what is the probability that he or she orders either a pizza or a salad