Answer:
1678 feet
Explanation:
In this problem, the submarine travels at an angle of depression of 40 degrees, and it reaches a depth of 2000 feet when it is finished with the dive.
Therefore, we can call:
the vertical distance covered by the submarine
= the horizontal distance travelled by the submarine
is the angle of depression
By analzying the situation, we notice that d and h represent the two sides of a right triangle.
Therefore, we can write the following equation:

Since h is the side opposite to the angle and d is the side adjacent to the angle.
The equation can be rewritten as

And by substituting the values, we find:
