Why does my profile keep saying + a number

Do you mean where it says Score: +32?

If this is what you mean, score is a point system you get for answereing questions.

If someone thinks you gave a good answer they can thumbs up for for 1 point, or thumbs down for -1

Also, mods can give a thumbs up for 3 points and a thumbs down for -3 points,

Finally, the person who asked the question can give you a thumbs up for 5 points, and a thumbs down for -5 points.

The "Top answerers" board on the right of you screen is based on this point system.

Good answer, NinjaDevo.