I trust my own interpretation a lot more than I trust theirs.

If you do not know the rules you should not be starting a business.While studying the rules join a local landlord or real estate organisation and speak with experienced landlords to learn how the regulations are interpreted and enforced in the area.

You must do credit checks and most importantly learn how to interpret a credit report.

If, for example, she is claiming mold caused asthma, the times she would not let the handyman in to fix the leak (causing the mold) could be interpreted that she is the cause of her own asthma, or at least mitigate her damages. 

Laws related to landlord/tenants are highly state specific, and are likely to involve a significant amount of case law interpreting the various rules and statutes cited.

But I'm finding the Calculation results to be a bit difficult to interpret.

Just because people can read is no indication they can interpret the intent of laws.

The correct answer depends on your interpretation of the question.It might be easier to understand the book answer if the question was phrased a little differently, rather than “What is your expected value for this investment?"

I'm not an attorney, but I'm interpreting that to mean they can sell the property without a clean title and that the quitclaim deed is the way they can legally do it.

I am not sure if I interpreted everything correct that is written in  your book, hopefully you can answer my questions here:I received a Tax Deed  (tax sale date: 2014) on december 4th, 2018.