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Why "cannot"?

I am not so completely old and my textbooks didn't take any particular model of calculator into account. Especially all the university math classes where it started to matter.

>>maxeri+(OP)
Speaking of my high school teachers, some of them could, but enough of them needed to be walked through it themselves. We only used calculators with specially designed lesson plans. Most of the time they sat in plastic bins on the shelf. (I guess we were lucky that the school got grants to buy them.)

It's possible that it's different now. When I was in high school, using graphing calculators was a new trend, and a lot of the teachers resented having to teach something they didn't learn in school.