8•(-0.25) would be -2 if that's what you're asking :)
F(2) is referring to the 2 on the x-axis. You can see that the point aligning with 2 on the x-axis is also 2 on the y-axis. Therefore, f(2)=2! hope that helped
3 is the first one.
-1 is the 2nd
and 7 is the 3rd
this is my answer but you need to check with your teacher