It doesn't matter as long as I put the corresponding units next too it. I figured out the problem even though he had posted he wanted the diameter of the bubble he really only wanted the radius. So our work was right just he was wrong. Thank you for all your help!
I know I am because this is like the third or fourth time it as happened! I have posted question after question on here thinking i am doing something wrong and then to find out it was an error on his part. It gets frustrating, but everyone makes mistakes.