Which equation applies the associative property of multiplication?

−6/5−(5/3−1/4)=(−6/5−5/3)−1/4
(−9/4⋅3/2)⋅(6/3⋅5/7)=−9/4⋅(3/2⋅6/3) ⋅5/7
(−1/2⋅4/7)+(−1/2⋅2/3)=−1/2⋅(4/7+2/3 )
8/9⋅7/4⋅(−5/8)=8/9⋅(−5/8)⋅7/4

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What is the area of the shaded sector?