1. The problem statement, all variables and given/known data, is best expressed in the photograph, as this is a fairly detailed problem: [PLAIN]http://img833.imageshack.us/img833/3972/pleasehelp.jpg [Broken] 2. all equations included in the image 3. the attempt at the solution is in the image as well When I take the limit of that last equation, I get a nonsensical answer--infinity. I am well sure that its not infinity. If anything, it must be negative infinity. What am I doing wrong? Is it my simplification? Is there a strategic error? Please help!! Found the same question here with some searching: http://expresshelpline.com/support-question-6498190.html the answer is not given, but that's a different approach, the person used the y=mx+b way.