F-holes are the name specifically for the holes in the violin family and the contrabass. The more general term is sound hole, which also includes the c-holes of the viol family or the large round hole of a guitar.
F-holes, in particular, are shaped pretty much exactly like an integration sign.
AP scores go from 1 to 5, with 5 being the best. A 3 indicates an average score. It will most likely not be enough to pass out of a college course, unless the university is less intensive in its calculus courses.
I mean they're right, Leibniz used a modified s for summa, sum. And an integral is just a sum, an infinite sum over infinitesimal summands, but a sum nevertheless.
ACKTUALLY neither. It's most simply thought of as a limit of progressively longer sums. Infinitesimals help people understand but they're kind of logically questionable.