This teacher came up with a clever idea

At least the teacher realized the times are changing and embraced it!

*QR code, not a barcode

I have that too, but it makes me angry because I like to do my work outside, away from wifi.

I can just imagine how that video must sound, "hi there, I can see you weren't paying attention to a damn thing I said in class so let's try this again"

Number 17 and 18 aren't problems they're statements. I assume it's the area they're solving but there isn't a question or a problem asked it's just giving facts. I always hated the "problems" like this in school. Seriously, it takes three words to tell you what it is you're supposed to do but instead they're like 4 and 8 and you're wrong. WHAT WAS THE QUESTION? There was no question you're just wrong.

I'm not even mad. That's cool