Answer this equation what is the answer to 1/4(k-1)=10

What is always true when two whole numbers are subtracted?

How can you find the mean absolute deviation (mad) for this set of data?

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