jadenxander08 jadenxander08 17-09-2021 Mathematics contestada Simplify by combining like terms in each of the following expressions. 1. 1s2 + 10s2 - 21st = 2. 5st + - st - t2 = 3. x2+ x2 + x3= 4. 6 x - 4 x + 2= 5. 9x - 3s - 2t= 6. 87x + 8x - 1 = 7. 3x + 6x - 2 = 8. 8s - 4s + 3s = 9. 12 +1x - 11 x = 10. 12x + 24 x - 3 x - 4 = 11. 14t + 8t - 12t = 12. 17g + 14g - 6g +g = 13. 13 + 12 -12 + 13x = 14. 17s - 3s + 3s = 15. 14t - 12t + t =