How to turn a Function into a Derivative.

Here are the given functions:

4
4x
4x^2

Here are the general rules:

Lets say the function is 4x^2, and we would want to transform that function into a derivative.  We would subtract any given exponent of a function by one, and multiply the number before the variable by that original exponent.
Therefore, the function 4x^2 would turn into a derivative.  The derivative of that function would be 8x.

Here are the solutions to the given funtions:

Function                  Derivative
4                             0
4x                           4
4x^2                       8x