Way back in high school precalculus, I had a particularly hard (and hard-ass) teacher. I generally scored in the 85-95 range, but one exam I was shocked to get a grade in the 60s. When I asked the teacher about it they pointed out that since I hadn't written my angles with the degree symbol (e.g. 45˚) that meant they were in radians, and thus very (very) wrong.
(68F is not a temperature — it’s a seat number.)
https://degreeswhat.com/?68