This document discusses multiplying polynomials by monomials using algebra tiles. It provides examples of multiplying different polynomials by monomials, such as 3(x + 4) = 3x + 12, x(x + 3) = x^2 + 3x, and -3x(2x + 1) = -6x^2 - 3x. It also models other examples like 2(x + 5) = 2x + 10, 4(3x + 1) = 12x + 4, and -5(-x - 2) = 5x + 10 to demonstrate how to multiply polynomials by monomials.