May someone please help me with this :)

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

Solve the system of equations. y= 2x y= x^2 - 15

At the "no mutants allowed" country farm, every sheep has 4 legs, every chicken has two legs, and all animals have only 1 head. asked to count how many sheep and chicken are in the fields, a farm boy reports back that there are 140 feet and 50 heads. how many sheep and chicken are there? there are sheep and chicken at the farm.