Question 4308 Deck General

The correct answer is D) 20,500 long tons. To calculate the displacement of a floating object, we can use the formula: Displacement (in long tons) = Volume of Displacement (in cubic feet) x Density of Seawater (in long tons per cubic foot). The question states that the semisubmersible displaces 717,500 cubic feet of seawater. Assuming the density of seawater is approximately 0.0284 long tons per cubic foot, the displacement can be calculated as 717,500 cubic feet x 0.0284 long tons/cubic foot = 20,500 long tons. The other answer choices are incorrect because they do not accurately reflect the displacement based on the given volume and the density of seawater.