1/7 is the answer to your question
The given expression
is equal to 144 or 
<em><u>Solution:</u></em>
Given expression is:

We have to evaluate the above given expression
We know that,


Substituting these in above given expression, we get

Also we know that,

Therefore,

Thus the given expression
is equal to 144 or 
F(x) = 3x
F(7) = 21
g(x) = -x + 1
g(7) = -7 + 1 = -6
(F x g)(7) = (21) (-6) = -126
Answer and Step-by-step explanation:
Well, Let's refer to the attachment shall we?
The first attachment is for 
And the second attachment is for 
And the third attachment is for when you combine them together.
Now it's up to you which graph suites best? You will get your answer by referring it with my graph.
Hope this will help you!