Answer:
The answer is Never.
Step-by-step explanation:
In order to determine the month, we have to graph both functions and then we have to determine the intercept point
of the functions. With this information, for any "x" value greater than
, one of both function will be greater that the other.
I have attached an image that shows the graph of both functions, where:
Red line: 
Blue line: 
As we see in the image, the intercept happens in the negative range of "x". Also we can see that the population of g(x) is always greater than f(x) for
.
Therefore, never the f(x) population will be greater than g(x) population.