Idk sooo please help

20 points

Step-by-step explanation:

Points:

21, 13, 14 and x for the last game

Average:

(21+13+14+x) / 4 = 1748 + x = 4*1748 + x = 68x = 68 - 48x = 20

They must score 20 points

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