"Where is the professor?"
Translation:¿Dónde está el profesor?
When you are talking about the position of something, the verb "to be" is translated as "estar" (and its conjugations).
Because it is talking about the verb Estar and Está is the conjugation for "Profesor" in this case.
This is the second time in ten minutes they called a correct answer wrong. I wrote en donde estat el professor? as the answer. They marked it wrong, THEN tell me the right way . Guess what? They told me my own answer. Not paying for this next time it is due!
I think your mistake is that you wrote "profeSSor" with two letters S, and the correct way in spanish is "profesor" with only one S.
I wrote it wrong in my post. They marked my correct answer as Donde esta el professor? as wrong. I then answered their way to move on. They marked it X too. They then said answer.. was ' en donde esta el profesor'. Some days ya can't win.