@dearra13
As I mentioned earlier, if the answer is *not* ten, it could be one of the many possibilities:
1. the test has an incorrect answer
2. the test question is different from what was posted above (typo, or the test is automorphic, i.e. changes the data every time the question is displayed)
3. All three or four people who responded to the question made the same mistake.
Since it is impossible to verify the exact question, we will have to leave it at that.
Retaking the test does not automatically mean that the question is the same. As I said, it is more important to know how to solve the problem, than to blindly copy the answer as your own.
@mcshweezy
For your future career in math, I suggest you study the remainder theorem to be able to solve the problem correctly. A frequently overlooked fact is that everything we learn in math is just a preparatory step for some other topics down the road. The remainder theorem that you are applying to solve the current problem will be needed when you will be solving polynomial equations, factoring polynomials, and solving differential equations, etc. If you do not build a solid foundation now, you will find that math is difficult, later on if not now already.
Here's a link to a site that explains the topic in an easy to understand language:
http://www.purplemath.com/modules/remaindr.htm