Step-by-step explanation:
The given function is :

(a) To find f(9), put x = 9 in the above expression.

(b) To find f(x+7), put x = x+7 in the above expression.

(c) To find f(-x), put x = -x in the above expression.

Hence, this is the required solution.
Answer: I think the last option is the correct answer.
Step-by-step explanation:
1. D 12 2/7
2. 22 7/9 which is B hope this helps
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