Your question is a little ambiguous, but I am assuming that you meant to say the function 
Thus, I am solving your question based on assuming the function such as

But, it would still clear your concept, no matter what the function is.
Answer:
we conclude that

The graph is also attached.
Step-by-step explanation:
Given the function

We know that the domain of a function is the set of input or argument values for which the function is real and defined.
As the function has no undefined points nor domain constraints.
Thus, the domain is

Therefore, we conclude that

The graph is also attached.
Answer:
the probability that the user is fraudulent is 0.00299133
Step-by-step explanation:
Let be the events be:
G: The user generates calls from two or more areas.
NG: The user does NOT generate calls from two or more areas.
L: The user is legitimate.
F: The user is fraudulent.
The probabilities established in the statement are:

With these values, the probability that a user is fraudulent, if it has originated calls from two or more areas is:


Answer:
Substitute point (4, 8)
y = y1 + m(x - x1)
y = 8 + m(x - 4)
y = 8 + mx - 4m
let m = 3 (It can be anything) Substitute m into equation:
y = 8 + (3)x - 4(3)
y = 2x - 4
The correct answer to this equation is G 1 year and 6 months. Hope this helped.