Derivatives were available for the most advanced level students in high school where I went. Even then it was understood that they were receiving college credit early. Linear algebra not at all.
Not too much with linear but usually 10th or 11th grade math will introduce matrix multiplication.
Which is odd, in my opinion. Linear algebra is easier than Calculus and would likely be more useful to the average person.
Agree completely. In my university, calc was a pre req for linear algebra and it didn’t make any sense to me then either.