You need to find the volume of EACH of the quadrilateral cube/rectangles and then add them all together. The equation for volume is the length times the width times the height. So the top one would be 3 times 2 times 1, which is 6. The second one is 3 times 4 times 1 which is 12. The third one is 6 times 3 times 1 which is 18. Add them together and you get 36 cu ft. The answer should be B
