the base of a pyramid covers an area of 13.0 acres (1 acre=43,560ft^2), & has a height of 481ft. If the volume of a pyramid is given by the expression V=bh/3, where b is the area & h is the height, find the volume of this pyramid in cubic meters.

It would be good if you showed us where you are having difficulty with this problem. The only tricky part is that once you calculate the volume in cubic feet (using the formula and data you were given), you will need to convert cubic feet to cubic meters. A quick online search yields the fact that 1 cubic foot = 0.028317 cubic meters. So once you get the answer in cubic feet, multiply by 0.028317 and you'll have the answer in cubic meters.