Which one of the following frequencies of a wave in the air can be heard.

uh since this is clearly a troll i'll just answer for points.

your answer is oof.

answer:

i havent taken the psat, but i have the sat, make sure to bring some snacks, because youre in there forever, 2 sharp number two pencils, an sat approved calculator, and maybe a jacket.   your phone and any books will be taken up, so don't try to bring them(but they will be given back at the end of the testing).   good luck!   i hope you do well!

answer:

stay friends trust me it will make things way more awkward if you avoid him.