Three times a number w is less than 18.

Me. i can't figure out this question. give an explanation too. .

What does independent variable and dependent variable mean in math?

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?