Which statement shows how the product of (x + 3)^2 demonstrates the closure property of multiplication?

x^2 + 9 may or may not be a polynomial
x^2 + 6x + 9 may or may not be a polynomial
x^2 + 9 is a polynomial
x^2 + 6x + 9 is a polynomial

There are two red jars of marbles and one blue jar of marbles. jars of a certain color have the same number of marbles in them. there are 38 marbles in total. the difference between the number of marbles in a red jar and the number of marbles in a blue jar is 10. find the number of marbles in each type of jar.