Question

I don't understand is 1 2 and 3 a linear a quadraticor exponential

Answer 1

A linear function has the form

`y=mx+b`

so number 2 is a linear function. The graph of the linear is

and it models constant growth.

A quadratic function has the form

`y=ax^2+bx+c`

so number 1 is quadratic. The graph of the quadratic is

and is decreasing in

`(-\infty,-4)`

An exponential function has the form

`y=a^x,\text{ a>0}`

then the number 3 is exponential. The graph of the exponential is

and eventually excedees the other functions.