M8 pls all I need is #9

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

Prove that quadrilateral is a rhombus.

The population of a small rural town in the year 2006 was 2,459. the population can be modeled by the function below, where f(x residents and t is the number of years elapsed since 2006. f(t) = 2,459(0.92)