C. 60 unit cubes.
Each level has 20 unit cubes, times 3 is 60 in total.
To find volume, you do length * width * height, in this case they are all 27.
So 27 * 27 * 27 = 19,683
So the cube is 19,673 inches cubed.
The slop is 8/5
Slop is just rude over run so from one point to the next it’s 8 points up and 5 points over