Which set of three numbers could be the side lengths of a triangle? a. 2, 4, 8 b. 2, 4. 6 c. 3, 5, 7 d. 3, 5, 9

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

For the first question the answer is a, for the second c, for the third d, for the 4th b, for the 5th a