This just goes to show how far down the rabbit hole our school system has gone.  Anyone who has even a passing acquaintance with math knows this is the symbol for a square root.

This should be a wake-up call to our Dept of Ed (read: Betsy DeVos).  Maybe we should make sure the teachers are actually TEACHING rather than spreading political gossip.

https://nalert.blogspot.rs/2018/02/students-in-louisiana-thought-this-math.html