Answer:
The plane will have an altitude of 10,937.5 feet after 15 minutes of decreasing altitude by 2.5% each minute.
Step-by-step explanation:
First we must find how much 2.5% is of 17,500 feet, which can be done by dividing 17,500 feet by 10, giving 1,750 feet, then dividing 1,750 feet by 4, which gives a rate of 437.5 feet per minute downward. After that, simply multiply 437.5 feet by 15 minutes to get 6562.5 feet, and finally subtract 6562.5 feet from 17,500 feet which gives 10937.5 feet.
Feet.
