HELP ME PLEASE

Describe the possible echelon forms of the standard matrix for a linear transformation t where t: set of real numbers is onto.

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?

What is the greater volume 72 quarts or 23 gallons