Pls help with this math

Can (3,5 and square root 34) be sides on a right triangle?

The table respent two linear functions the equation respented by the first tables is given

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?