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

Like for example number 39 would be the 2 because it is a term

40- 2

41- 1

42- 1

43- 3 and 2

44- 3 and 2

45- 1/2

46- 1/2

47- 2

48-2

Step-by-step explanation: