The volume of the pyramid shown in the figure is 9,15,21, or 63 cubic centimeters. if the slant height of the pyramid increases by 4 centimeters and its height increases by 2 centimeters, the volume of the pyramid increases by 6,9,12 or 21 cubic centimeters.

the slant-height plays no role on that equation to get the volume, only the height does, and the Base, so the slant-height going from 7 to 11, has no bearing on the volume, since we know the height



so hmmm, it was 15, then it went up to 21, 21-15 = 6, went up by 6 units