GIVEN: 16 . 20 . 20 . 0 /24 Requirement : - I need 4 networks ; IP subnet zero is not?

I haven't done calculations like that in close to a year now (and would need to review how to again), but there are numerous free subnet calculators available on-line. Have you tried those?

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.