19) A submarine dives to a depth of 657 feet below sea

level and then goes up 79 feet. What change in its depth

will bring the submarine back to sea level (0 feet) ?

To bring the submarine back to the sea level, it have to move 578 feet upwards

Step-by-step explanation:

Given:

Initially the depth the submarine dives = 657 feet below sea

The height the submarine moves up = 79 feet

To Find:

Change in its depth required to bring the submarine back to the sea level = ?

Solution:

In initially the Submarine will be at the depth of 657 feet below sea

when it goes up, the the depth reduces

657 - 79 = 578 feet

Now the submarine will be the depth of 578 feet

Now the submarine have to move 578 feet upwards to reach the sea level