The first section of drop downs are:
cube root of (x-1)
(Cube root of x) -1
-(cube root of x) -1
-cube root of (x -1)
The second sections of drop downs are:
Cube root of (x -1)
(Cube root of x) -1
-(Cube root of x) -1
-cube root of (x-1) has

the 8 in 8,420 is in the thousands place so it's value is 8 thousand.

the 8 in 6,870 is in the hundreds place so it's value is 8 hundred.

divide 8000 by 800 to find the answer:

8000 / 800 = 10

the 8 in 8,420 is 10 times greater than the 8 in 6,870

you need to rotate this triangle about the origin 270 degrees clockwise to create the full square.