Answer:
x≠-1,1
Step-by-step explanation:
f(g(x)) is a composition where g(x) is is substituted for x in f(x).
Recall, f(x) is 2/x. So we write 2/|x|-1. This places x in the denominator and 0 cannot be in the denominator x. Any value of x that makes the denominator 0 will not be in the domain.
|x|-1=0
|x|=1
x=1,-1
Answer:
Second option: 
Step-by-step explanation:
You know that "x" represents the Avery's weigth (in pounds).
Let be "y" the weight of Jada in pounds.
Since Jada weighs 18 pounds more than Avery, you can write this expression:

The weight of them together is:

Substituting, you get:

Therefore, the expression that tells how much the two of them weigh together is the one provided in the second option:

Answer:
I think there must be g(x) instead of 8(x) in the question. You can look the solution but i have corrected it and then solved it.