Answer:
x
12
[12,∞]
Step-by-step explanation:
Answer:
The angle of elevation is approximately 
Step-by-step explanation:
Notice that the two pieces of information given: "400 ft away from a building", and building that is "850 ft tall", can be regarded as the two legs of a right angle triangle (see attached image).
Then the angle
that we are trying to find (the angle of elevation) can be found by using the arc-tangent function:

the radius is d/2. r=41/2 r=20.5
Step-by-step explanation: