The first three terms of an arithmetic sequence are: -3, 1, 5 A. Find the common difference
B. Find the 16th term
C. Find the sum of the first 16th terms
(please help me correctly last questions i uploaded no one answered or did it wrong)

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