Which of the following describes the input in a function?

In the context of a function, the input represents the independent variable that you provide to the function. This input is crucial because it directly influences the outcome, or output, of the function. For instance, in a simple mathematical function like f(x) = 2x + 3, the value of x is the input. Changing the input value will result in a different output from the function, demonstrating that the input has a direct impact on the output.

This concept illustrates that a function's behavior is determined by its inputs, allowing us to predict or calculate outputs based on varying input values. Inputs are not constants, nor are they always unchanged, and they certainly should not be confused with the outcome of the function, which is calculated based on the selected input.