Sentence 1: the trouble is they think they can buy it for a thousand dollars or less

Sentence 2: They think it's not very expensive, but they're wrong.
Is this second sentence entailed by the first?

Answer: yes

Sentence 1: The only two finalists with any kind of a shot are Miss America--a surprisingly leggy Pat Buchanan--and Miss Germany--an unexpectedly amiable Adolf Hitler.

Sentence 2: Only Miss America and Miss Germany can win.
Is this second sentence entailed by the first?

Answer: yes

Sentence 1: Francisco de Zurbarin (1598 1664), a member of the Seville school, combined mysticism and realism and was a master of light.

Sentence 2: Zurbarin combined art types in ways no one had before his time.
Is this second sentence entailed by the first?

Answer:
it is not possible to tell