If your away-from-home food bill was $520 in november 2012, what was it in november 2013?

An unknown number of kids and buses are getting assigned. when assigning 4 kids to each bus, there are 2 kids that aren't placed in a bus. when assigning 8 kids to each bus, there are 2 empty buses. how many total kids are there?

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.