Answer:
What I think are the answers are C,D, and A, hope this helps.
Step-by-step explanation:
Line Q, you always want the line that has as many dots on it as possible!! :)
The answer is 6 inches, 3*3*3 equals 27, the current volume of the cube, 27*8 equals 216, the new volume, 6*6*6 equals 216, so the side lengths equal 6 inches.