Answer:
The initial amount
Step-by-step explanation:
Given

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Required
What 5000 represents
The given formula represents an exponential function

Where
initial value
So, by comparison:

<em>In this context, 5000 represents the initial amount</em>
Sorry I can't do number six, but the answer to number five should be ≈24.01 using the cosine ratio.
The angle of elavation would be 45°, this is because straight up would be represented by 180°, and 90°, would remain as 1200 ft traveled, and half of 90°, is 45° which would double the distance traveled