Which is greater than 4? (a) 5, Which is the smallest? (a) -1, Combine terms: 12a + 26b -4b β 16a. (a) 4a + 22b, Simplify: (4 β 5) β (13 β 18 + 2). (a) -1, What is |-26|? (a) -26, Multiply: (x β 4)(x + 5) (a) x2 + 5x - 20, Factor: 5x2 β 15x β 20. (a) 5(x-4)(x+1), Factor: 3y(x β 3) -2(x β 3).