The domain of f(x) is the set of all real values except 7, and the domain of g(x) is the set of all real values except -3. which o
following describes the domain of (gºf)(x)?
all real values except x=-3 and the x for which 'x) - 7
all real values except x=-3 and the x for which f'x) -3
all real values except x 7 and the x for which f(x)=7
all real values except x 7 and the x for which fx) --3

Division is the splitting of large numbers (in this case) numbers into equal groups of smaller numbers.
Here are some terms you need to understand before you divide:
The number being divided is called the dividend.
The number that you're dividing by is called the divisor.
The answer that you get to the division problem is called the quotient.

For example:
Let's try dividing 4 ÷ 2 .
Since 4 is the number being divided, it is the dividend.
And since were are dividing 4 (the dividend) by 2, 2 is the divisor.
We need to try and find the quotient to solve 4 ÷ 2 .

Think of it this way;
There are 6 cookies and we need to divide them equally so that 2 people can have the same amount of cookies.
6 ÷ 2 = 3
You know the answer is 3 because 2 goes into 6 three times. 2 × 3= 6 (Since you asked a question about division, I'm guessing you know multiplication.)
3 for one person and 3 for the other.
So how many does each person get? 3 cookies, fair and square.
A nice way to check this problems is fact families, as I have mentioned before with the multiplication problem.
Hope this helps! 
-- Alina (: