well the truth is, everytime i comeback to this question i feel discouraged to continue because i really don't understand how to approach the question and then of course solve it. Normally the textbook has some sort of answer i can use to work backwards with, but seeing as it's a bonus question, they don't provide solutions or answers.
so really, even if someone could get me started or anything that may be of help it would be greatly appreciated!
thanks so much