WikiAnswers does alert you when a question you asked has been answered. At the home page and on question pages, the bell used for notifications at the top-right of the page will have a red notification box to let you know about questions you've asked that have been answered.
A lot of them.
Yes, IF you click on "Watch Question" which is under the answer box to a question, or on the word "Watch" which is in the blue box to the left of each question, then you can get an email telling you if your question has been answered, but only if you are a registered member, so WikiAnswers will have somewhere to send the email.
If you are not signed in, it is impossible to alert you as to when your question has been answered - multiple people can contribute from your IP Address.
There will be a phrase that says this question has not been answered yet then click on answer this question that will be under that phrase
Because you can't answer a question that has never been asked. Ideally, there there should only be two kinds of questions on WikiAnswers - those that have been answered, and those that will be answered. When a contributor comes across a question that hasn't been answered, and they know (or think they know) the answer, they will put it in. That is how the collection of questions and answers grows.
"Enter a question here" is the box for you to ask your new question on WikiAnswers, or to ask questions that may have already been asked and answered.
If your Questions have been answered than wikianswers will send you an email.
If it does not get answered, you just have to wait. If you do ask again,( which is not recommended) it will not get your answer any faster. If your question was spammed, or just plain nonsense, then your question would have been deleted, and it will never have been answered.
Well, Just like "that" - you just did it! Good Job!
Currently - the oldest question in the 'Questions about WikiAnswers' section is How did Microsoft impact WikiAnswers- posted on 25th May 2007.
If you mean on WikiAnswers, no, they are not an answer on WikiAnswers. If a person has absolutely no information to put in an answer, they should go to another question that they can answer or at least partially answer. Answering a question even with "I don't know" makes that question appear to be answered on WikiAnswers, which means it is less likely to BE answered, because people will think it already has been.
As of August 13, 2013, there are 19,591,633 questions that have been answered on WikiAnswers.