In six months the membership at a fitness center went from 3,500 to 4,200. what was the percent of increase in the membership? a: 10%b: 15%c: 20%d: 16 out of 2 over 3% show work you!

Apyramid fits exactly inside a cube. the cube and the pyramid share the same square base, and they are both exactly the same height. the volume of the cube is 66 cubic inches. what is the volume of the pyramid? explain your answer. answer asap