Euler’s number e is a mathematical constant that begins with 2.71828. Just like pi (π), it is non-terminating, which means it goes on and on. It is also an irrational number, ...

Now that you know the math, you can see that e-1 =0.37 and 1-e-1 =0.63. If you want to do the actual math, you can always set up a spreadsheet . Anything that grows or shrinks exponentially is a ...