Variables as Specific Unknown

Variables as Quantities that Vary in Relationship

Variables as Parameters (this one I totally don’t understand)

Variables as Generalized Numbers

Variables as Objects

I e-mailed my professor and told her that our book doesn’t explain it very well and I googled and yahooed these terms but couldn’t find anything that made sense. She e-mailed me back and agreed that google and yahoo didn’t have anything. She did say if she came across a better definition she would let me know. She did tell me to look in Middle School and High School Algebra I & Algebra II books, but I didn’t find anything about these types of variables. If anyone could help me I would be very gratefully