Jesse wants to build a wooden chest with a volume of 8,100 cubic inches. the lenght will be 30 inches and the width will be 15 inches. how tall will jesse's chest be?

Assuming the chest is a rectangular prism, the volume formula is just length(width)(height), or y = lwh

The final volume is 8,100 inches, which can replace the y. The length is 30 inches, which can replace the l. The width is 15 inches, which can replace the w. Now all you have to do is fill in the blanks and solve. 

8,100 = h(15)(30)
8,100 = h(450)
8,100 / 450 = h
18 = h

It will be 18 inches tall.