With which method of sampling does every memeber of all parts of the population have an equal chance of being selected?

How many 2/5s are in 1 and 1/2 plz someone me right now

Acompany made a profit of 75000 over a period of 6 years on an initial investment of 15000 what is the annual roi

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?