Katieperezzzz Katieperezzzz 21-01-2016 Mathematics contestada Simplify the expression 3. 9a- b-2a-10b A. -7a+ 11b B. 11a + 9b C. -11a - 9b D. 7a - 11b 4. 5(x + 10) + x A. 6x + 15 B.5x + 15 C. 6x + 50 D. 4x - 50 Please help me please