Classof1 is a supplemental education company providing comprehensive online tutoring, homework guidance, and e-learning courseware development services to the school, college, and university student communities. As a part of its endeavor to help students around the world to excel in their studies, Classof1 has built a repository of self-study guides with step-by-step solutions and lucid explanations. These guides have been created and whetted by expert tutors with several years of experience in education. Apart from Docstoc.com, these self-help guides are also available at Classof1’s Solution Library (http://classof1.com/solution-library). Please visit www.classof1.com for further information.