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