What it a lot of mathematical equations or technicalities that was involved?

I am really intrigued by the mathematics BP-type investors are using to calculate cashflow. 

Organize your debt and attack either highest interest rate first (mathematical approach) or lowest balance first (Dave Ramsey approach.).

So, Ramsey's approach would preclude 999 people out of 1,000 from even entering the game.A more mathematically to the point answer would be to underscore that the two most pertinent ways of measuring the ROI on any investment (including RE) are Cash on Cash and Internal Rate of Return (CCR & IRR).  

I could think of a few scenarios (perhaps a monster W2 income where you're getting completely hosed on taxes and expected it to continue for the next 10 years) where it MIGHT make mathematical sense to eliminate any cash flow, but I doubt it, even then.

'Google' is a mathematical term, not a search engine per se.

Hello my name is Tanisha Heard and I am a Mathematics Teacher and International Marketing Affiliate for Renatus, LLC.

They now earn 10% interest on their deposit and mathematically in 30 years due to compounding their deposit will grow to equal the purchase price of the house.

I'll side with their research and mathematical modeling and not pay them and just pay for repairs/replacements myself. 

Given that the Fed has been raising rates and we are in a rising rate environment wouldn't that mathematically devalue multifamily properties as cap rates rise?