I still use HS algebra. It's used to find hidden values. Before, I had to do that in my head. Like determining how long a trip will take you. If velocity equals distance divided by time, it's simple. Turn the equation around, and you find that time equals to distance divided by velocity. So if you're traveling a hundred miles at 55 MPH, it should take you about 1.8 hours (or, one hour and 49 minutes) to reach your destination. About two hours, IOW.
