Please help its for my midterm

Cavaliers principle states that two solids with equal heights and cross-sectional volumes at every level have equal areas.

The first several steps of evaluating (−2) (3 4 7 ) are shown, including the distributive property. (−2) (3 4 7 )  = (−2) ( 3 + 4 7 )  = (−2)(3) + (−2) ( 4 7 )  = (−6) + ( −8 7 ) what is (−2) ( 3 4 7 )

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