I was helping a student in College Algebra. She was working on a problem that asked her to evaluate a composition of functions u and w when x = 7, where u(x) = x^2 + 6 and w(x) = SQRT(x + 9). As she calculated, she used her calculator to calculate 7^2 + 6 and once again 55 + 9. Clearly her lack of

I'm on a roll :-) tadwatanabe.wordpress.com/2025/07/24/c...

My first blog post in a long while. tadwatanabe.wordpress.com/2025/07/08/m...

There is an interesting article, What is a Mathematical Concept?", by Martin Simon in the recent issue of Mathematics Teacher: Learning & Thinking. I wonder what people think about Simon's idea.