Welcome to the board Pete.
One of the objectives of a PLC course is to get the student to thinking about how to solve the problem rather than giving a solution to the problem. That's probably why the book doesn't give the answer to the questions. Thats how it is in industry - often there are no ready made solutions. There are may of us here who are willing to to help them reason through the problem solution, but not so willing to just give the answer out - after all, eventually we will find ourselves working with those students after they complete their schooling and enter the field and want competent coworkers who won't endanger us or others.
Students should feel free to post a question, propose a solution or a method to arrive at the solution, and if the sudent shows some effort, many will be happy to mentor.