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????????????????????????-example-1
User Gtrak
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I think D is the right answer.
User Tim Stack
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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.
User Aliah
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