The concept of Function (maths) in our lives and its purpose

Question

Reflect on the concept of function. What concepts (only the names) does a person need to accommodate the concept of function in their mind? What is the simplest function one can imagine? In day to day life, is there any occurring fact that can be interpreted as a function? Is it possible to view a function? What strategy can be used to get the graph of a function?

Answer 1

Well, I do not know if it is the simplest, yet i think of pumping gas into my car.

The price that I pay is a function of the amount of gas pumped.