1. The problem statement, all variables and given/known data Please see questions (c) and (e) on the attachement 2.Relevant Equations 3. The attempt at a solution So long story short, these two questions were given out as a challenge in one of our Swedish lessons to see if we could remember our high school calculus, which I shamefully have to admit I cannot. I've done a search through the forums but unable to find any relevant information that could help me solve these equations. If anybody is willing, could someone post links, or steer me in the right direction that could help me solve these?