Premise:
"It's true that some of his later work sounded like the desperate effort of an aging star to sell records to rock fans."
Hypothesis: John Lennon's later work sounded like that of an aging star.

it is not possible to tell

Premise:
"I guess the professional always scores over the amateur in the end."
Hypothesis: It makes sense because the professional is constantly training.

it is not possible to tell

Premise:
"There are also watercolors, drawings, prints, sculpture, and a multimedia gallery where a computerized system offers information about 100 of the gallery's best works."
Hypothesis: While there are a multitude of items in the gallery, it has no sculptures to this day.
no