I though that I was supposed to take the sqrt of 7000, convert the result to feet, and then re-square it to get D as the answer, but appearantly the answer is
7,000 feet beneath ocean floor, deep-sea drill sets record | Fox News
Flight level - Wikipedia
Solved At sea level the air that surrounds us presses down | Chegg.com
Petroleum production - Deepwater Drilling, Subsea Manifolds, and ROVs | Britannica
7000 Feet To Meters Converter | 7000 ft To m Converter
Map K STONE MOUNTAIN STOKE MOUNTAIN MEMORIAL STATE | Chegg.com
The Menir dos Almendres, a lone standing stone about 4 meters (13 ft) high, pointed to the summer solstice sunrise when it was viewed by prehistoric people about 1.4 km away amid