Which formula is as same as pythagoras's

(a.) distance formula
(b.) midpoint formula
(c.)slope formula
(d.) all of these

Which equation requires the division property of equality to be solved?

Solve for x, y, and z. show all steps.

Giuseppi's pizza had orders for $931.00 of pizzas. the prices were $21 for a large pizza, 514 for a medium pizza, and $7 for a small pizza. the number of large pizzas was two less than four times the number of medium pizzas. thenumber of small pizzas was three more than three times the number of medium pizzas. how many of each size of pizza were ordered?