Sentence 1: Usually, the causes are an addictive or mental disorder.

Sentence 2: This is usually caused by addition or mental disease.
Is this second sentence entailed by the first?

Answer: yes

Sentence 1: His signature pictures--of adolescent girls exhibiting their genitalia--contain most of this show's electricity (John Updike, the New York Review of Books ). Several critics observe that Schiele can only do nudes.

Sentence 2: His signature pictures are of nude teenage girls.
Is this second sentence entailed by the first?

Answer: yes

Sentence 1: As a practical matter, mailers are believed in many cases to be able to do this work for a fraction of the cost the postal service would face.

Sentence 2: Mailers generally tend to be cheaper because they are women.
Is this second sentence entailed by the first?

Answer:
it is not possible to tell