High School Mathematics

I am very grateful that I can still remember my high school maths.  It means that I can help the kids with their homework.  Today I was working on Year 11 algebraic equations with Samantha.  It's amazing how quickly it all comes back!  That being said, Sam has a very fancy calculator that actually can assist in some of these type of equations, and I have no idea how it works.  I guess I should read the guidebook, because I may have to know it in two years time (and then again in four years time).  Sigh....  Sometimes technology doesn't always make life better!