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 Jun6 comment I'm looking a compound interest formula. The future value formula from that link is what I was looking for. Jun6 comment I'm looking a compound interest formula. @Amzoti Yeah, I suppose that's the correct terminology. Feb12 comment Finding derivatives of Trigonometric Functions These are starting to click now. Feb12 comment Finding derivatives of Trigonometric Functions That makes perfect sense now for that problem, but I'm having trouble applying that same approach to this problem $$p = \frac{6+secq}{6-secq}$$ I tried moving the bottom -sec(q) to the top and making it -cos(q) but am not able to get even close to the correct derivative of that function. Feb10 comment Using the alternative formula to find the derivative of a function? Good point. I should have included the lim z->x on every step. Feb10 comment Using the alternative formula to find the derivative of a function? @MJD Somebody fixed it for me. There was a red /[ before and after each equation. And when I tried to delete those, it would break my formatting. Feb1 comment How can I calculate the time two people will meet if they are paddling towards each other on a lake? Yeah, it just clicked. thanks Feb1 comment How can I calculate the time two people will meet if they are paddling towards each other on a lake? @HenningMakholm Ken is 4miles closer and kara is 7 miles closer. Therefor the gap between them is now 19 miles. After 2 hrs the gap would be 8miles. Got it: 4x + 7x = 30