Answer:
Please check the attachment.
Explanation:
The adjacency matrix is the matrix that has nodes as rows and columns. The nodes if connected is stated as 1 or else 0. And the adjacency list representation is the list with nodes and connected nodes. The nodes that are not connected are not being listed. The diagram and list as well as matrix can be found in the attachment.
In a file extension, it tells what type of file it is and tells what compiler to run the code.
You need some more criteria. Is this a webpage? If so.. What language(s) are applicable for writing your web application. My profession is systems development, do I do a lot of fronte-end/ back-end development. I don't mind helping, just need some more information. If not what resource does this need to be created in?