Final answer:
The volume of the square base pyramid is 14,400 cubic feet.
Step-by-step explanation:
To calculate the volume of a square base pyramid, you can use the formula V = (1/3)Bh, where B is the area of the base and h is the height. In this case, the base length is 30ft, so the area of the base is 30^2 = 900ft^2. The height is 48ft. Substituting these values into the formula, we get:
V = (1/3)(900ft^2)(48ft) = 14,400ft^3