This is my first time using this website; I have been told great things! Onward to my question:

What are some popular formulas used in everyday life? (i.e.; the distance formula or the simple interest formula) I would use one of those but I have no clue how to tie them into something I do everyday. I also need to provide a solution to the formula/application. Is there anyone who can help me out? I don't expect the work to be done for me, but if I could just get an idea of some popular formulas, that would be great; right now, my mind is blank! Thanks so much.

~Rachel