A function is a rule that relates what

Answer 1

A function is a rule that relates an input, typically referred to as the independent variable, to exactly one output, known as the dependent variable. In mathematical terms, a function assigns each element from a set called the domain (inputs) to an element in another set called the codomain (outputs). A function can often be represented as $f(x)$, where $x$ is an element from the domain and $f(x)$ is the corresponding output. Functions can describe various relationships between quantities in mathematics, science, and engineering.