Simplify the expression 3(5c)

Iam so stuck. what is the worked out answer for this question?

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.

98 point question what is the record for most points in one