Question

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Answer 1

I think D is the right answer.

Answer 2

f(x) is a function, and f(5) just means that you have to evaluate the function's value at 5 by simply plugging the number in. So, in this case:

f(5) = 3(5) + 2
f(5) = 15 + 2 = 17

So, your answer is D.