the sum of doubling a number and 100 which totals to 160 Take this algebraic expression in pieces: Let the number be n. Double it, means we multiply n by 2: 2n The sum of this and 100 means we add 100 to 2n: 2n + 100 The phrase which totals means we set 2n + 100 equal to 160 2n + 100 = 160 <-- This is our algebraic expression If the question asks you to solve for n, then we type this equation into our search engine and we get: n = 30
