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QUESTION 18 Suppose you calculate the second derivative of a function to be f(x)-14x-91 and that one critical point? of the critical points is 13. Using the second derivative test, what can you say about the origin al function, f(x), at this O The function has a maximum at 13. The function is increasing for all x < 13. The function has an inflection point at x = 13. O The function has a minimum at 13 O The function equals 0 at 13.

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→ (13)つ /y (13)-91 ニ91 ri:

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