In my day job and I am mathematics teacher in California's public school system (my wife and business partner is a teacher as well) and this profession offers me plenty of time off to work on our real estate portfolio.I started my financial journey five years ago by focusing on educating myself in the world of Personal Finance (r/personalfinance).

I am also a poor immigrant who came to NYC 7 years ago.Currently in college studying Applied Mathematics. 

I think that one is especially good at preparing you for the mathematical portions of the license exam.

Car Leases are even worse than car payments.Car dealerships make an average of $1300 per car on Leases, $775 on financed cars.New Cars depreciate 60% in four years, so 0% Interest still a bad deal NEW.The average millionaire drives a2 year old car with no payments.New car mathematically does not justify having a warranty.He doesn’t believe in building up your credit with cards to qualify for a mortgage.He uses debit cards over credit.

Your pain of having a 30 year note is emotional, not mathematic.

Mathematically you are usually better off consolidating under a single loan, but many people find it more emotionally satisfying to be able to clear out the debts one at a time.

A common mathematical model that companies use for a problem like this is known as a Monte Carlo Simulation.

You can do mathematical analysis for cash on cash return.

With more rentals it will not be mathematically possible.

Since the cap rate is a mathematical derivation of commercial values and net operating income, it seems tautological to claim that rising capitalization rates will either drive down commercial values and/or increase net operating income (by driving up rents).