Answer:
Zak's change in elevation is 12 feet per second.
Explanation:
Consider the provided information,
Zak goes parachuting and descends 24 ft in 2 seconds .
He maintains a steady descent now we need to find what integer represents Zak's change in elevation in feet per second?
To find this simply divide the numbers as shown:

Hence, Zak's change in elevation is 12 feet per second.