To find the vertical distance between Kale and the family of dolphins, you can subtract the depth of the dolphins from Kale's depth:
Kale's depth: -647 feet
Dolphins' depth: -112 feet
The vertical distance \( D \) between Kale and the dolphins is:
\[ D = (-647) - (-112) = -647 + 112 = -535 \]
The negative sign indicates that Kale is deeper below sea level than the dolphins. The vertical distance, therefore, is 535 feet.
So the correct answer is: 535 feet