a rule that takes an input, does something to it, and gives back exactly one output. In other words, for every input, there is one and only one output.
Function
a symbol (usually a letter like x or y) that represents a number or value in a mathematical expression or equation. Variables are used to represent unknown values or quantities that can change.
Variable
describes how one quantity changes in relation to another. It is often used to describe the slope of a line.
Rate of Change
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