Answer:
Yes, but the X is only one of many variables that can be used to represent an unknown value. You can use any letter. though X is the most common.
Answer:Yes
Step-by-step explanation:
(f o g)(7) = f(g(7))
but g(7) = 7-4 =3
(f o g)(7) = f(g(7)) = f(3) = 3² =9
5 in
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