Answer:
to find the height of the storage unit, we can use the formula for volume:
Volume = length x width x height
We know that the volume needs to be 400 cubic ft, the width is 10ft and the length is 8ft. So, we can plug in these values and solve for the height:
400 = 8 x 10 x height
400 = 80 x height
height = 400/80
height = 5 ft
Therefore, the height of the storage unit needs to be 5 ft.