Answer:
The number e , sometimes called the natural number, or Euler's number, is an important mathematical constant approximately equal to 2.71828. When used as the base for a logarithm, the corresponding logarithm is called the natural logarithm, and is written as ln(x) .
So f(x) shows us the function is called "f", and "x" goes in. And we usually see what a function does with the input: f(x) = x2 shows us that function "f" takes "x" and squares it. Example: with f(x) = x2: an input of 4.
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