What are the simplest line and quadratic function you can imagine? In your day to day, is there any occurring fact that can be interpreted as lines and quadratic functions?

Answer 1

For some fixed number constant C, the simplest line is y=c or x=c. The former is a horizontal line. the latter is a vertical line

The simplest parabola would probably be y = x^2

For daily applications, there are many.

One example:

the path of any object thrown up in the air, as it rises and falls, is a parabola

the price of a product from one day to the next, rises or falls per a linear function.

blood pressure, over a 15 second period, can be modeled with a linear function.