Please help me ill mark as brilliant if its correct:)​

Cindy uses 1-inch cubes to find the volume of a jewelry box shaped like a rectangular prism. she uses 780 cubes to completely fill the jewelry box with no gaps or overlaps. if the jewelry box is 13 inches long and 5 inches wide, how tall is cindy’s jewelry box?

H(x)=4x2-5x h(-3) what is the answer?

Identify a1 and r for the geometric sequence an= -256(-1/4) n-1