Mathematics Homework Help

Hey thanks so much for helping me out.. I’m at a really tough point in my life right now and I can’t appreciate your help enough. Please try to show all your steps and work and avoid using a computer program except for graphing. I’d appreciate it if you could finish these 4 questions in under 90 mins. I posted all of them together in our chat on the other question. This is question 4 about: an series electric circuit consisting of a resistor, capacitor and inductance