Answer
a) The function increases indefinitely when $u$ goes to $0$ and the function decreases indefinitely when $u$ increases (without bound).
b) $\lim\limits_{u \to 0}=+\infty $ and $\lim\limits_{u \to +\infty}=-\infty$
c) There isn't a horizontal asymptote.
Work Step by Step
Answer given by direct observation of the graph.
