Just high school math? You can probably just use Khan Academy for that. They have a full course on integral calculus, last I checked. Be sure that you learn actively (don't just watch the videos) and do lots of practice problems. Good luck to you.
The slope of a line perpendicular to another line is just the negative reciprocal of the slope of the other line.
So, if you have a line where m=2, the slope of a line perpendicular to that line would be m=-1/2.
Hello, Physics Forums! Allow me to introduce myself. I am currently in high school (11th grade) and I want to get a PhD in Physics someday, specifically in astrophysics.
I have been interested in Astronomy and Physics since I was a young child. I have read books on the two subjects for as far...