After moving into a new house, a couple wants to have a concrete patio poured to support a hot tub, because... well, because it's a hot tub. The plans call for a 8 ft by 9 ft slab of concrete 6 inches thick. Convert the volume of concrete to cubic yards. (Hint: A cube that is one yard on each side is also 3 feet on each side. You can use that to find a conversion factor from cubic feet to cubic yards.) If necessary, round to two decimal places. Rounding to two decimal places, they will need _____ of concrete