Applications of Function Models
Key Questions

There is no clear cut way to do this, but if a data set is clustered around a straight line, then a linear model is appropriate. It is a little trickier to distinguish between a quadratic model and a exponential model. Remember that an exponential function tends to grow faster than a quadratic function, so if a data is displaying a rapid growth, then an exponential model might be suitable.
I hope that this was helpful.
Questions
Quadratic Equations and Functions

Quadratic Functions and Their Graphs

Vertical Shifts of Quadratic Functions

Use Graphs to Solve Quadratic Equations

Use Square Roots to Solve Quadratic Equations

Completing the Square

Vertex Form of a Quadratic Equation

Quadratic Formula

Comparing Methods for Solving Quadratics

Solutions Using the Discriminant

Linear, Exponential, and Quadratic Models

Applications of Function Models