Xavier's conclusion is not valid because to correctly test

Xavier's conclusion is not valid because: To correctly test the effectiveness of the plating soil, the amount of sunlight received and the consistency of the watering should be equal to ensure accurate results. (This question has already been asked before, not enough info provided regardless)...

divide by 8

2.25 cubic units

Step-by-step explanation:

3 x 6 half cubes = 18 half cubes

one cubic unit =1/8 cubic units

18/8=2.25 cubic units