1: For internal communications purposes a public network is not necessary. In fact having that network connected to the internet is not even necessary if it is only being used for internal communications. When having it connected to the internet then the correct security measures need to be in place. There should never be an open free network that originates from the organizations side. Public networks are ok as a convenience to consumers but as a consumer I would never do anything personal while using their open Wi-Fi network.

2:A characteristic that a public network possesses is that it is completely visible to the internet. This allows access of content and information on the network to any individual who is connected to the internet.

Do you see this as an advantage or a disadvantage?

3 :Wi-Fi services offered by restaurants and coffee shops are a perfect example for public network.
Do you think accessing private information on these kinds of public network is considered safe?

4: The steps to solving a linear inequality 4-x<20, this step is not correct, what will b the correct step?
Subtract both sides by 4 4-4-x< 20-4
Divide both sides by -3 -x/-3 < 16/-3
Flip the sign x> -16/3

5: Yes a linear equation and inequality can be solved the same way by multiplying and dividing both sides. You just follow the same steps in order to get your solution and\or solution set. But they have at least one difference between them the inequality sign flips once a negative comes into the equation answer.

6: Yes they can however, you have to account for variables, and like terms. You must continue to execute Distributing, Combining, and Inverse operations on both sides, combine like terms, and ensure to remember to bring down the negative or positive signs. For example:

2x+4=3(2x-6). A rule of thumb that I use, it to always copy the portion of the equation that I am not touching to keep everything organized.