Question

why has mr trelawney hired the captain, the ship and the crew in power and arms

Answer 1

Becuse trelawney wants a loyal crew
Trelawney buys the schooner Hispaniola, hires Captain Smollett to command her, and retains Long John Silver, a former sea cook and now the owner of the dock-side "Spy-Glass" tavern, to run the galley. When it comes to hiring a crew for the ship, he depends highly on the advice of Silver, who recruits a group of fellow pirates.

Livesey warns Trelawney to be silent about their objective, but he cannot keep a secret and everyone seems to get to know about the nature of the mission

Answer 2

Mr. Trelawney hired the captain, the ship and the crew because he was in possession of a map showing treasure in one of the island and he now was in the look for it .

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