Well, my exams are over and here I am going to post the questions I have difficulty with. In the first question, I am able to derive that Ix(0+) = (4-Vc(0+))/6 and that Ix(t) = (1+2e-1000t) / 3 for t>0. However, I am not sure how to calculate the energy absorbed by capacitor over 0<t<∞ and the amount of charge deposited into the capacitor. Can someone explain how the first 2 equations relate to the 3th part because I only know how to solve them blindly. Do kindly ignore my markings on the exam paper.