399 divided by blank equals 3.99

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?

How are algebraic expressions evaluated using substitution?

Find the volume of the wedge cut from the first octant by the cylinder z=12-3y^2 and the plane x+y=2.