HELP! I don’t know how to solve this and i’m so confused

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?

The hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?

If sin(x) = 0 and cos(x) = 1, what is tan(x)?