An airplane begins its descent at 1 1/2 miles above the ground. After 15 minutes, the airplane is mile above the ground. Find the change in height of the airplane. If the airplane continues to descend at this rate, how long does the entire descent last?

45 minutes

Step-by-step explanation:

If its 1 mile above the ground in 15 min from 1 ½, that means it descended ½ mile in 15 min, and if you multiply ½*3, you get 1 ½ miles, so multiply 15 minute * 3 and it would take 45 minutes for the entire descent to last

the square root of what number? if you add that, then someone will probably answer the question.