I swear that for the cube question, it was 4.75cm for the upper bound for each cube length and then it was 2.5mm radius for the lower bound of the spehre and then 4.75 into mm= 475. And because the radius of the sphere was 2.5, the diameter was 5mm. So in one line of spheres going up the metal cube there would have been 475/5= 95 and then you do 95 cubed to get the number of spheres which is 867,375 because you can't use the whole cube to make spheres because they have don't fit perfectly into a cube and there will be wasted space