Read the introduction (advertisement) and sections 1.1 through 1.4. (If your mathematical background does not meet the course requirements, this next ten days of catchup may be among the more difficult of your life!)
Note on the solution process. Consulting with classmates (or with instructor during office hours) on concepts and techniques for solving problems is encouraged. However, the actual solution of each problem in each assignment is to carried out in full by the individual submitting the problem for grading. Understanding emerges (sometimes painfully) from the solution process.
Always include enough intermediate steps between the statement of the problem and the final result that the grader can follow your reasoning. Generous partial credit will be given for work that is seen to be largely correct, even if a mistake or two along the way has invalidated the final result.
Check for obvious mistakes. A vector can never be set equal to a scalar, for example, nor a mass to a force.