Deleting files which have been broken pointers for 6 years.
Fix bug 2683, answer computed incorrectly.
Fix bug 2721, bad random parameters
Add clarifying instructions to problem text

If necessary, use \( k \) to denote an arbitrary constant.
Fix bug 2724, and convert to mathobject
Fix bug 2726, duplicate problems
Fix bug 2727, duplicate problems
Fix bug 2730, bad error messages.
Removing unneeded lines.
Added white space
Adding filter to catch errors when using must_include
Fix bug 2731, poorly formated augmented matrix.
Fix bug 2736, duplicate removal
Fix bug 2737, formatting matrix
Fixed bug 2739 and removing unused files
Change domain of function evaluation

Fix bug 2740
Add popup lists and fix variable name in solution

Bug 2734
Fix domain of function evaluation

Bug 2742