Ships a and b or 1425 feet apart and detect a submarine below them

Step-by-step explanation:

See attachment for complete question

Let the position of the submarine be represented with X

Given

First, we calculate angle at X.

Solving (a): Distance AX: The distance between ship A and the submarine

To do this, we apply sine formula which states

In this case:

Substitute values for AB, and

Make AX the subject

Solving (b): Distance BX: The distance between ship B and the submarine

To do this, we apply sine formula which states

In this case:

Substitute values for AB, and

Make BX the subject

8(-10x+3.5y-7)

8×-10x + 8×3.5y + 8×-7

-80x + 28y - 56

therefore

-80x+28y-56 is the correct answer