Which statement shows how two polynomials 3x + 6 and 5x2 − 4x demonstrate the closure property when multiplied?

a: 15x3 + 18x2 − 24x may or may not be a polynomial
b: 15x3 + 18x2 − 24x is a polynomial
c: 15x3 + 42x2 − 24x may or may not be a polynomial
d: 15x3 + 42x2 − 24x is a polynomial

I’m stuck on this equation, anyone got the answer?

Afarmer has a large field that is x feet in length. he wants to fence in a rectangular section in the middle of the field , leaving a length of 100 feet of open field behind each end of the fenced rectangle.he also wants the width of the fenced-in space to be 100 feet less than its length. find the expressions to represent the length and width of the fenced section of the field

Which expression is equal to (21)(7)(3x) using the associative property? (21 · 7 · 3)x (7)(21)(3x) 32(7 + 3x) (3x)(7)(21)