Plea

identify the mistake that was made simplifying the expression. then correctly simplify the expression.

5(a+7) - 3(2a+3) - 3a
5a + 35 - 6a + 9 - 3a
(5a - 6a - 3a) + (35 + 9)
-4a + 44

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