20: Symmetry: None.
Intercepts: (1,0) for t = 0; (0,−2) for t = 2; and

Limits:

Possible asymptotes. Try it:

Thus no asymptotes (note: y "pulls more" for t (minus) infinity).
Picture:

Next investigate directions in which the curve goes and mononoticity of the resulting graph, inclusing "interesting" points.

Next hint
Answer