Convert 23/4 into mixed number

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?

Is it true or false i’m trying to pass this test so i can leave school

Can any one me with the answers to these questions asap?