Question

Represent the following number as integer with appropriate sign:

A sub - marine is moving at a depth of eight hundred meters below sea level.

Answer 1

Consider sea level as zero level or reference level that means distances measured upwards is counted as positive while the all distances measured below the sea level is negative.

Now if the sub marine is at a depth of 800m below sea level, that means it is -800m, as can be seen from below diagram also.