2 times the sum of 7 times a number and 4 This is an algebraic expression. Let's take it in 4 parts: The phrase a number means an arbitrary variable, let's call it x. 7 times a number means we multiply x by 7: 7x The sum of 7 times a number and 4 means we add 4 to 7x: 7x + 4 Finally, we multiply the sum in #3 by 2 Build our final algebraic expression: 2(7x + 4)