I need to learn how to solve questions a and c, thanks.

 

Hi Dont,
As this is Homework, you must post your best attempt at answering, then we help.
E

 

If you can't do (a), how is it that you can do (b)? If you can do (b), how is it that you can't do (c).

The first thing is to open the same textbook to the part where they go through converting a circuit from the time domain to the s-domain and follow the steps provided.

Then show your best attempt to get as far as you can, and we can then help you identify where you are going wrong and what to do about it.