To identify the horizontal asymptotes from the graph, we examine the behavior of the function as $x \to \infty$ and $x \to -\infty$.

Looking at the graph:

• As $x \to -\infty$ (far left), the curve approaches the x-axis but doesn't seem to cross it, suggesting a horizontal asymptote at $y = 0$.
• As $x \to \infty$ (far right), the curve also appears to flatten out towards the x-axis, suggesting another horizontal asymptote at $y = 0$.

Thus, the horizontal asymptote is:

$y = 0$

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Here are 5 related questions:

1. How do vertical asymptotes differ from horizontal asymptotes?
2. How can you find horizontal asymptotes algebraically for rational functions?
3. What is the behavior of this graph near its local maximums and minimums?
4. Are there any points of inflection visible on the graph?
5. How does the degree of a polynomial affect its horizontal asymptote?

Tip: Horizontal asymptotes describe the behavior of a function as $x$ goes to infinity or negative infinity, and they may or may not intersect the graph!