When I was in high school, everyone thought the math courses would be the things we never used. However, even though there are some parts I've never used in real life, I have used things covered in my high school and college math classes in just about every job I've ever had, and some parts have been used multiple times per day.

I don't mean to dog history, because that's important also, but I've rarely "used" something from high school history in my daily work.