4. (20 points) Use the results in Appendix C of Greenberg to invert the Laplace transform In s s(s+1) Part of your answer should be expressed in terms of the function (t)= S'e" (- In t)dt. 4. (20 points) Use the results in Appendix C of Greenberg to invert the Laplace transform In s s(s+1) Part of your answer should be expressed in terms of the function (t)= S'e" (- In t)dt