The above problems are meant to illustrate the use of a matrix handler as a computational device. Many of them are not empirical, it just illustrates how to apply a matrix handler to common problems in finance and economics, and how useful it can be in that context.
You need to do the exercises as you would write the results in an academic paper: Tables summarizing results, detailed descriptions of what is estimated in the table, and a text discussion of what the results mean. In an appendix you should provide the exact estimation in the form of computer code, typically in R.