Mary, it doesn't make much math sense at all. IT is specific what to do, but I am dumbfounded on what the purpose is, and it is not apparent what the purpose of the assignment is, unless to confuse students beginning Algebra I. I suspect the person who created this problem is math illiterate, and the purpose of the assignment is beyond me.
If you were my child, I would be in the Principal's Office Monday morning, telling him that this is bull remains, and I intend to take it to the school board, and then do that. We do not operate schools to practice nonsense. You stay out of this, it is a parent task.
Now for the assignment: Name 10 creatures for C. For example: Raccoon, bear, squirrel, ... . Then make up 10 more creatures for c2. Such as Horse, Elephant, Giraffe.
Then write ten problems such as this.
4elephants+3Racoons + 5=0
IT is a good time to mention what math is.... http://en.wikipedia.org/wiki/MATH