What is the approximate circumference of a circle that has a diameter of 20 centimeters

Find the constant of variation for the relation and use it to write an equation for the statement. then solve the equation.

How can you find the mean absolute deviation (mad) for this set of data?

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?