What is the recursive formula for this arithmetic sequence?
-7,-1,5, 11, ...

Name the quadrilaterals that have four equal sides.

Percent increase and decrease. original number: 45 new number: 18

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?