Answer:
B)
Step-by-step explanation:
Here, the given functions are:

Now, g(x) - h(x) is :

⇒
B) Hence, 
The domain is the numbers you can use for x
so the domain is 4
the range is the possible y values we get from that domain
we get all real numbers because it goes up and down infinitey
domain is 4
range is all real numbers
in order to know the greatest common multiple of 84 you would have to compare it to another number
Answer:
I think this is the correct solution