Is getting 20 problems correct out of 25 the same as getting 24 problems correct out of 30? show your work and explain your answer

On a piece of paper graph f(x)=5•(0.4)^x

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?

The bottom of a vase is a square. each side measury y+11 units. the square has a perimeter of 55 units what is the value of y?