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Step-by-step explanation:
28. (a×b)×c = a×(b×c)
=(4/5×2/3)×-1/3 = 4/5×(2/3×-1/3)
=8/5×-1/3 = 4/5×-2/9
= -8/15= -8/15
= 1:1
= 1
29. volume of cuboid= l×b×h=0
=(x+3)(x+5)(x+2)=0
=3x+30=0
=3x= -30
= x= -30/3
= x= -10.
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