Don’t understand this problem

Recall the definition of a polynomial expression. find two polynomial expressions whose quotient, when simplified,is. use that division problem to determine whether polynomials are closed under division. then describe how theother three operations-addition, subtraction, and multiplication-are different from division of polynomials.

Which best explains why this triangle is or is not a right triangle?

What could explain what happened when the time was equal to 120 minutes