University Problem - Network/Subnetting - Need Help asap

[mmx]

I'm taking Applied Networking in Florida International University in Miami, Fl.
I love the class, and etc...

But i have to do a Extra credit Project, and still don't understand how to do.
The problems are here:
http://www.cs.fiu.edu/~esj/cgs4283/thtest.html

Chart with Dotted decimal numbers:
http://www.cs.fiu.edu/~esj/cgs4283/binary.html

How do i find the network number the host is on and the
directed broadcast for the network and an example of any one valid
IP address on the network

Lets say 129.171.192.5/18

I'm so lost, its not funny.

Please if someone could help me explaining how i find.....

Thanks

 

[Nohr]

First step, post in the Networking forum.