fixed a problem to require simplified rational expressions
edited wording
added ** to image statement
added solutions, PGML, and tweaked math object usage
this problem was using a list checker that is not behaving well for a list consisting of one assignment; so I copied how quadratic euqations with a single solution are handled. Ideally, the list checker would be fixed, but no time
clarified instructions for input
fixed bug with last part
added hint for a particular wrong answer
corrected typo in solution
minor edits on two problems
solutions for three problems
Merge branch 'develop' of /opt/webwork/courses/vega-LibDev/templates/local/PCC into develop
missing $ from a perl variable