19. Y(s) = perform the appropriate partial fraction decomposition, and then use the result to find the inverse Laplace transform of the given function. 1 (s+2)(s-1) 1 20. Y(s) = (s+3)(s-4) 2s -1 2s-2 21. Y(s) = 22. Y(s) = (s + 1)(s - 2) (s-4)(s +2) 7s+13 7-s 23. Y(s) = 24. Y(s) = s+2s-3 s+s-2 13s5 4s + 15 25. Y(s) = 26. Y(s) = 2s2-s 2s + 3s