Pls help I'm not sure

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.

41/2 - 1 1/3 what is the answer as a fraction?

5,600 x 10^3 = a) 560 b) 5,000,600 c) 5,600,000 d) 56,000