Calculus
posted by Nathan .
The top of a 24 foot ladder, leaning against a vertical wall, is slipping down the wall at the rate of 4 feet per second. How fast is the bottom of the ladder sliding along the ground when the bottom of the ladder is 7 feet away from the base of the wall?

x^2+y^2=24^2
x dx/dt + y dy/dt = 0
Now you just solve for dx/dt, since you have x,y,dy/dt 
I only do this on Non Owner Occ. properties, in CO we have some new laws that make fpinplig even the LLC or Trust beneficial interest a NoNO .Even if you get an acceptance letter with no resale for 60 days, you just sell the entity. This works for properties your selling to cash or hard money buyers. Flipping to owner occupants getting traditional financing, not going to fly because of the entity they need to close in their own name to get that kind of loan.
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