oh so you're a dog too ahhh i get the lore now

Have you heard of VOLUME

your teacher couldnt hear it because they were killed by some certain painter in 1945

Yes it does

Domain expansion

CRT MONITOR

There's so many different things this could be

You could be playing a sound in your headphones/earbuds
You could be playing a frequency higher than the teacher can register
The teacher could be deaf
And blah blah so on so forth

Or you could be on a zoom school w3ith your microphone off

Stuff like this

*turns nerd mode on* errm actually it makes sense because when you grow up you start losing the ability to hear high sound frequency

It’s called volume