Please help for 20 points

Which of the following properties is represented by (ab)c = a(bc)?

Associative Property of Addition

Commutative Property of Multiplication

Distributive Property

Associative Property of Multiplication

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

$22. if larry's profit were to minimize by one for every hour his store were to be closed, we would subtract 30 by 8.