I agree with LindaSmith1! You need to have about 10 hubs. This is the safest number of hub to get passed the insufficient content issue.
Plus, I suggest that you visit hubs on Google Adsense (a sample will be this http://hub.me/adjiD ,but there are still a lot of these here). There are practically a lot, where you will gain some wonderful insights about the process. Plus, you will know what to avoid in order to get accepted easily after you resolve the insufficient content issue.