A pyramid has a height of 481 ft, and its base covers an area of 13.0 acres (Fig. P1.18). The volume of a pyramid is given by the expression $V=\frac{1}{3} B h,$ where B is the area of the base and h is the height...

 18. A pyramid has a height of 481 ft, and its base covers an area of 13.0 acres (Fig. P1.18). The volume of a pyramid is given by the expression $V=\frac{1}{3} B h,$ where B is the area of the base and h is the height. Find the volume of this pyramid in cubic meters. $\left(1\right.$ acre $\left.=43560 ft ^{2}\right)$