So, what I did was retrace my steps and do the problem backwards. So, i rotated -2,1 to get -1,2. From there I translated it to get -2,5. When I got -2,5 I knew that had to be the one.
Yes, because you can simplify it to .2 which can be written as a fraction. Irrational numbers are those ones that keep going with an infinite string of numbers past the decimal.
