Question

A submarine started at 750 meters below sea level. It rose 50 meters per hour over a 4-hour period. Which expression represents

the new position of the submarine in relation to sea level?
(-750 + 4) * 50
- 750 - 4 x 50
- 750.4 x 50
750 + 4 x (-50)

Answer 1

The answer is C.

Step-by-step explanation:

The submarine is starting below sea level so it is a negative number. It rose 50 meters per hour in a 4 hour period.

After reviewing this all we can start to put together the equation.

-750 + 4x50, AKA answer C.

Answer 2

Option(d)

750+4x(-50)

Step-by-step explanation:

We are given that submarine started at 750 meters below sea level and rose 50 meters per hour over a 4 hour period. So, the distance traveled by submarine in 1 hour = 50 meters.

Hence, distance travelled by submarine in 4 hours is 50x4 = 200meters. The current position of submarine below sea level will be given by subtracting distance travelled from the starting position.

So, current position = 750 - 200 meters below sea level = 550 metres below sea level which is given

by the expression 750+4x(-50) i.e = 750 - 4x50

= 750-200

=550