When I first started writing here, I had read with hubpages that they dont recommend applying till you reach ten hubs. If you google search and you get answers a year+ ago you see people getting in with only a handful.
More recent hubbers will let you know you really need about 20 now. Google has tightened up on acceptance. Don't get discouraged just keep writing. I got accepted after my 19th hub. I was declined after my 17th.