SOLUTION: An airplane flying at an altitude of 6 miles passes directly over a radar antenna. When the airplane is 10 miles away (s = 10), the radar detects that the distance s is changing at

Algebra ->  Trigonometry-basics -> SOLUTION: An airplane flying at an altitude of 6 miles passes directly over a radar antenna. When the airplane is 10 miles away (s = 10), the radar detects that the distance s is changing at      Log On

First, we treat x and s as variables:



Now we freeze the variables when s=10, and we use the
value of x when s=10



Now we substitute s=10, x=8, and 



The speed of the airplane is 287.5 mph.

Edwin