To find these three, just plug in their respective x values into the original function.
For f(-3), plug -3 into f(x)
2/3 (-3) -1 = -2 - 1 = -3
f(-3)=-3
2/3 (0) -1 = -1
f(0)= -1
2/3 (9) - 1 = 5
f(9)=5
Basically f(x) just means plug whatever x is into the function.
f(x) = 2x
f(2) = 2(2) = 4
f(4) = 2(4) = 8
f(x) = 6/x
f(3)=6/3 = 2
etc.
Hope this helps :)
-Jeron