Is -13/1 rational or irrational

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?

Which expression is equivalent to (3^2)^-2 a.-81 b.-12 c.1/81 d.1/12

Find the vertex of the function given below y=x^2-6x+1