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Let F be degrees Fahrenheit, a unit commonly used in the United States, and let C be degrees Celsius, used almost everywhere else. Oh, but ours is the right one. Sure...

We can convert from one temperature system to the other using the following formulas:

Sample Problem

If the temperature is 86 degrees Fahrenheit, what is the temperature in Celsius?

First of all, it shouldn't matter. We're at home, indoors, mostly naked, and standing in the kitchen with the refrigerator door wide open.

Okay, we'll play along.

Let F = 86. Then C = 5/9(86 – 32) = 5/9(54) = 30, so the temperature is 30 degrees Celsius.

That sounds deceptively cool. No wonder everywhere else is crazy. 

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