Answer: He cannot see a ship that is 4.5 miles away.
Step-by-step explanation:
Since we have given that
[tex]d=3\sqrt{h}[/tex]
Here, h is the eye level above the water
d is the distance away.
If h = 12 feet
We will get :
[tex]d=3\sqrt{12}\\\\d=3\times 2\sqrt{3}\\\\d=6\sqrt{3}\\\\d=10.39[/tex]
Hence, it is 10.39 feet away when eye level is 12 feet above the water.
Therefore , he cannot see a ship that is 4.5 miles away.