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5000 BTU is a tiny amount of cooling - are you sure you don't mean 50,000 BTU? A 5000 BTU might give you a drop of 5 degrees C in a 6' x 8' office with no south facing windows, as long as the ceiling isn't too high. For a normal 10' square room, 12,000 BTU is a more reasonable starting point, then add more for sources of heat gain in the room.
If you've ever flown then you used complex numbers. The basic equation w=z+1/z is used to design air foils (airplane wings). While you don't actually concern yourself with these equations anymore than the thermodynamic equations that govern the running of your car's engine. Check out the related link for some interesting application of imaginary and complex numbers, though.
You cannot jump twice in Transformice, however you can jump in the middle of the air. This is called "air jumping" This can be done by leaving a platform, not by jumping off it but simply by walking off it. This allows you to jump once in the air. For everytime you have contact with an object or platform in gains you the ability to jump once.
Air, thoughts, dreams, anything intangible
It would be 65- about the cost of a math tutor 2 days a week.