Length of the block of marble in question is (l) = 8 feet Width of the block of marble in question is (w) = 2 feet Height of the block of marble in question is (h) = 78 inches We already know that 1 inch = 0.08 foot So Height of the block of marble in question (h) = 78 * 0.08 foot = 6.24 feet Then Volume of the marble block = i * w * h = 8 * 2 * 6.24 cubic feet = 99.84 cubic feet From the above dduction we can conclude that the volume of the marble block in the shape of a rectangular prism is 99.84 cubic feet.