Afish tank in the shape of a rectangular prism has dimensions of 14 inches .16 inches and 10 inches the tank contains 1680 cubic inches of water what percent of the fish tank is empty

The formula for the volume of a rectangular prism is

V=l*w*h      where l=length  w=width and h=height
plug in the data that we know
V=14*16*10
V=2240in³

So out of a volume of 2240in³, only 1680in³ are filled with water.

1680/2240=.75 or 75%
75% of the tank is filled with water

So...

100%-75%=25%

25% of the tank is empty