Since the formula for the volume of a pyramid is V=1/3Bh
You would do V= 1/3 (144) (12)
You get 144 (the area of the base) by doing s^2 since that is the formula for the area of a square since it says, "pyramid with a square 12-yard base" you would do 12^2=144
Knowing all that you then solve. Giving you a Answer of V=576 yards^3