zaehairston6254 zaehairston6254 01-06-2021 Mathematics contestada Determine whether 4x + 15 + x is equivalent to 5(3 + x). Complete the sentence to justify your answer. Applying the to 5(3 + x), you get 15 + 5x. 5x is equivalent to x + x. Therefore, 4x + 15 + x is to 5(3 + x).