You can estimate your distance from a lightning stroke by counting the seconds between the flash you see and the thunder you later hear. by what integer should you divide the number of seconds to get the distance in kilometers?

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?