plZZZZZ HELP (06.03 MC) Which of the following best describes the expression 9(x + 7)? The sum of constant factors 9 and x + 7 The product of constant factors 9 and x + 7 The product of a constant factor 9 and a 2-term factor x + 7 The sum of a constant factor 9 and a 2-term factor x + 7