Is means =
less than is subtract
1/2a -8=2
if you need to know how to do it let me know
So you would just have to divide 20/7 to get the percentage of it.
The answer would be 2.85%.
179 / 9 is about 20
exact = 19.888888
The statement "unit cubes with side lengths of 1/2 foot are added to fill the prism with no space remaining" is useless information so you can disregard that. All you need to know to calculate the volume is the length, width, and height.
Volume = length x width x height
Volume = (5/2) x 3 x 11/2
Volume = 15/2 x 11/2
Volume = 165/4
Volume = 41.25 ft cubed