Question

A submarine was 144 feet below sea level. A shark was hovering at a constant depth above the submarine. The submarine’s depth was twice the depth of the shark.

Which integer expression describes the position of the shark in relation to sea level?

Answer 1

–144 ÷ 2

Explanation:

i took the test.

Answer 2

`-72` feet : Shark is 72 feet below sea level.

Explanation:

Let x represent depth of the shark.

We have been given that the submarine’s depth was twice the depth of the shark. This means that depth of submarine would be
`2x`.

We have been given that a submarine was 144 feet below sea level, so submarine's elevation would be
`-144\text{ ft}`.We can represent this information in an equation as:

`2x=-144`

To find shark's position, we need to solve for x.

`(2x)/(2)=(-144)/(2)`

`x=-72`

Therefore,
`-72` feet represents shark's elevation, which represents that shark is 72 feet below sea level.