6) Subtract, simplify if necessary:

19) Factor completely (remember you can check your answer if you want to be sure):

21) Factor completely (remember you can check you answer if you want to be sure):

When performing a vulnerability assessment, many organizations use ____ software to search a system for any port vulnerabilities.

20) Factor completely (remember you can check your answer if you want to be sure): 

When TCP/IP was developed, the host table concept was expanded to a hierarchical name system for matching computer names and numbers known as the ____.

Name the open area that the pointer is pointing to: _______

Instead of using a key or entering a code to open a door, a user can display a ____ to identify herself.

17) Factor the polynomial completely:

24) Factor completely: