I need help please I forgot how to do this

If f(x)= sqrt4x+9+2, which inequality can be used to find the domain of f(x)?

The graph of a function f(x)=(x+2)(x-4). which describes all of the values for which the graph is negative and increasing? all real values of x where x< -2 all real values of x where -2

Typically a point in a three dimensional cartesian coordinate system is represented by which of the following answers in the picture !