11.you can search for any mathematical expression, using functions such as: sin, cos, sqrt, etc. you can find a complete list of functions here. raddeg x! inv sin ln π cos log e tan √ ans exp xy ( ) % ac 7 8 9 ÷ 4 5 6 × 1 2 3 − 0 . = +

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