Which number is a factor of 20,but not a multiple of 10

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?

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)

Select the lengths in centimeters that would form a right triangle