The result of which expression will best estimate the actual product of (-4/5) (3/5) (-6/7) (5/6)?
a (-1) (1/4) (-1) (-1)
b (-1) (1/2) (-1) (1)
c (-4/2) (3/2) (-2/5) (5/2)
d (-3/4) (-3/4) (-1/5) (1/2)

Best answer that i found on yahoo ok   set :   x= length of 2nd piece in cm  x- 3= length of 1st piece in cm  x-4= length of 3rd piece in cm  then since you know they all came from the 20 cm ribbon you add them together and set them equal to 20x+ x-3 +x-4 = 20  3x - 7= 20  3x= 27  x= 9  the shortest piece is the third piece which is x- 4  x-4  9-4 = 5  the length of the smallest piece is 5 cm.  the other lengths are  9 cm  6 cm

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