Can you please help me out with the number 3 question?

I would be really thankful if you could help me out with the details. I am really confused about this assignment. And please don't copy other answers to here.

1. What is computer theory and why is it worthy of study? computer theory is the stady of the circuntt and logic. 2. Briefly describe the four (4) fundamental concepts of computer theory listed below. a. Notion of language Syctem of simdts used to cormenuncotir b. Concept of configuration or state Systitm refors for the anargement of eade of the furction units c. structural constraints on computations d. Intrinsically impossible computations uncanttio pridiens incalculabe? 3. Give the formal definition of a regular expression. Sequence of sboucteis thot sperfies a seirct pattan in tert 4. List the five (5) shortest words for each of the following regular languages with ={a,b} (if possible): a. (ab)(ab) ab,aa,bb,ba b. ((ab)(aa))(ab)((ba)(aa)) abba abaa a.aba asaa c. (a+ab)(a+ab)b aabab