a. f(x) = 3 — — x 13. Which of the following has a horizontal asymptote at y = 0 ? 1 - X c. f(x) = 1 b. f(x) == X+2 1 = d. all of the above 17x+4 1 14. What is true about the function f(x)= as x∞o? x+4 a. f(x)0 from above b. f(x)0 from below c. f(x) → 1/1/1 d. f(x)→ ∞ 15. Which function is always positive? a. f(x)= 2 5x+4 1 1 b. f(x)= c. f(x)= d. B and C x²-2x-15 (x-5)²

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