Interesting stock photo.
The kids look too young for that lesson. Who teaches American 11 year olds how to divide by square roots?
Then look at the numbers on the board. The decimal point is a comma, The “7” has a cross bar, and the “1” looks like a tilted ”^”.
And look at the height of the electrical outlet.
That’s a European, Russian, or Israeli class. Picture wasn’t US at all.
Certainly not a public school in CA.