This is really off-topic.
Many years ago, the son of some friends of ours was graduating from high school and heading to Georgia Tech to study engineering. I wrote a paper on some basic mathematics that he would encounter in his engineering studies.
If you have, or know, a child who is heading to college for engineering, mathematics, physics or related subjects, this paper may be of use to him or her. If you find errors in the paper, please let me know.
Mike
[Oops, the paper is larger than the the forum allows for .pdf. You can see it here.]