Final answer:
The number 25 in the equation h = 1250 - 25t represents the rate of descent of the elevator, which is a 25-foot decrease in height for each additional second.
Step-by-step explanation:
In the equation h = 1250 - 25t, which describes the height of an elevator over time as it descends from the top of a skyscraper, the number 25 represents the change in height of the elevator for every additional second of travel time. This is known as the rate of descent. Since 't' corresponds to time in seconds, and 'h' corresponds to height in feet, the '25' in the equation indicates the elevator descends 25 feet each second. Therefore, the correct answer is (C) The change in the elevator's height for every one additional second.