Question 16 does not give enough information to solve. It should read like this:

At a 4th of July fireworks display, a man stands 40 feet away from a bottle rocket being shot vertically into the air **at a rate of 25 feet per second**. At what rate is the angle of elevation between the man and the bottle rocket changing when the bottle rocket is** 40 feet** in the air?

Please also note that I have changed the height of the bottle rocket from 30 feet to 40 feet. This will make calculations easier. Hope this helps.

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