In which way does a U.S. Intellectual Property artifact enter the Public Domain?

Consider the Clique-3 problem: Input: an undirected graph G=(V,E) such that every vertex has degree at most three. Output: a subgraph of G that is a clique of maximal size.  Check all true statements:

The spinal cord and the brain make up the Central Nervous System.

What is E°cell for the following reaction? [blank1]2Au(s) + 3Ca2+(aq) → 2Au3+(aq) + 3Ca(s) Is the reaction spontaneous? [blank2]

For a certain reaction ΔHrxn = -65.2 kJ. Calculate the change in entropy for the surroundings (ΔSsurr) for the reaction at 25.0 ºC. (Assume constant pressure and temperature.)

Select the U.S. Intellectual Property law that best describes statement. The owner has legal right to prevent use by others, not exclusive right to use.

The statement “a problem P is in the class NP-complete” is equivalent to

Which historical event is most responsible for establishment of copyright law?

Which employee/independent contractor factor is most important to the courts?

Select the Fair Use factor that best describes the scenario. National Lampoon published a parody of the popular story The Hunger Games called The Hunger Pains.  Because the title and cover art of both books were very similar, many readers mistakenly purchased the parody.