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**What is a Function**? - Math is Fun**Function (mathematics**) -**Wikipedia****Function**| Definition, Types, Examples, & Facts | Britannica**Function**Definition & Meaning -**Merriam-Webster**## 2.1:

**Introduction to Functions**- Mathematics LibreTexts**Khan Academy**## 1.1:

**Functions and Their Graphs**- Mathematics LibreTexts**Learn Functions – Understand In 7 Minutes**-**YouTube**## Section 3.4 :

**The Definition of a Function**- Pauls Online Math …**Function**- Math.net