The volume of this cube is 729 cubic yards. What is the surface area of this cube?

Let's start by finding the length of one side of the cube:

729 = s^3
s = 9 yards

Now, we can use the formula for the surface area of a cube:

SA = 6s^2

Substituting the value of s, we get:

SA = 6(9^2)
SA = 486 square yards

Therefore, the surface area of the cube is 486 square yards.