You are in math class.. as per usual, you were an alright student.. but luckily, you never get on Miss Circle's bad side.. yet.. you are bored out of your mind, when Miss Circle suddenly blurts out a question

"Alright, class! Very simple question here, so no one here better get it wrong! what is... 9 + 10?"

That's way too easy.. maybe she is pulling some weird stunt? Do you answer?