Sally has been measuring the tree in her yard for a science project. the tree has grown 1/2 of an inch each month and gotten a total of 2 inches taller. how many months has sally been measuring this tree?

Arestaurant offers delivery for their pizzas. the total cost the customer pays is the price of the pizzas, plus a delivery fee. one customer pays $23 to have 2 pizzas delivered. another customer pays $59 for 6 pizzas. how many pizzas are delivered to a customer who pays $86?