countable collection of disjoint measurable subsets , math homework help

Hello, please I need you answers this questions with details so I can understand it :

# 3 and 4 page 302 , 4 page 305 , 2 and 4 page 310 , 6 page 311 , 2 and 3 page 315 , 5 page 315.

the book methods of real analysis, goldberg and the link the book below:

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