I can't ask for clarification at the moment unfortunately. I emailed my TA for clarification, but I haven't gotten a response and I don't think that I'll get a response in time.
For part a I know the conservation of angular momentum is used, but I am not sure how to formulate the equation from the information given in the problem. I know that after the equation has been set up you set it up to solve what Rf is. For part be isn't the finial and initial rotational kinetic...