Max observes the zoo and the library from a helicopter flying at a height of 300 times square root of 3 feet above the ground, as shown below: what is the distance between the zoo and the library? 300 feet 600 feet 900 feet 100 feet

For this case, the first thing to do is find the horizontal distance from the plane to the zoo and the library respectively.
 We then have the following trigonometric relationships:
 For the zoo:
  
 Clearing d1 we have:
 
 For the library:
  
 Clearing d1 we have:
 
 Then, the distance between zoo and library is:
 
 
 The distance between the zoo and the library is:
 600 feet

Yes you are correct

9/12 is the answer because 3/4 times 3 each is 9/12