Is this website suggested to be used by teachers? Seems like kids are just dropping in their questions and get all answered by others? Is this a concern for anyone else?
Yes, it is a concern. However, we delete these answers if posted within a day or so of the posting of the question. Answers posted after that are frequently wrong. Some people just post them as a prank. Other answers are wrong because teachers often change the order of the questions and/or answers.
What we tutors generally do is either confirm of a student's answer is correct or not. Or we also show the student how to solve a particular kind of problem.