> Richard, can you comment on my paradox? > > These lessons are orientated towards pre-calculus > seniors. > Not all, Bob. I happened to watch 2 of them and the first of them was 'Differentiating Instruction' which was aimed at a quite diverse 9th grade class.
> How could a student successfully complete algebra, > geometry and algebra 2 and be so completely deficient > in the notion of mathematical argument as is depicted > here? > > This would indicate that they did not successfully > complete algebra, geometry and algebra 2. > I think it would be the norm in many classes for students to look to the teacher as the arbiter of whether an argument is correct.