Answer:
The twins would be 13 years old.
Step-by-step explanation:
21+21+21+13+13 = 89
Answer:A B C D
Step-by-step explanation:
it is A B C D
Answer:
C. 
Step-by-step explanation:
We want fg of x, so first we have to multiply f(x) times g(x).



We can cancel out an x from every term.

Let's rewind a little to get this into one of the answer choices.
is our answer.
Start at 4 and since it a negative go down one and over one