The answer is n=18
Hope this helps :))
Answer:

Step-by-step explanation:
We have a right angled triangle given.
At first, let's note that, sin θ = oppposite side of the triangle / hypotenuse of the triangle.
Now, in the given triangle, from the view of ∠θ,
- Opposite side of the triangle = 8
- Hypotenuse = 10
Then,


This problem can be solved directly by neglecting the
initial velocity given. All we have to do is to plug in t = 4 in the given
equation. That is:
h = -16^2 + 123 * 4
h = 236 ft
I really do not get it . It’s this a question ? If so can you be a little more specific .