1. The problem statement, all variables and given/known data See Q2, Method 1 part c. 2. Relevant equations 3. The attempt at a solution http://a5.sphotos.ak.fbcdn.net/hphotos-ak-ash4/316587_2275178233577_1072324659_2439905_368313036_n.jpg" [Broken] I have obtain all eqtn I need but I cannot figure out how to get the equation of c. I have been trying for few days and my friends tell me that it is possible that Dr made a mistake. Since without part c, we can still do part d easily. Can anyone help me to see weather there are any error in the question?