Answer:
Integer that represents Melissa's location with respect to sea level:
Integer that represents Brian's location with respect to sea level:
Step-by-step explanation:
By definition, Integers can be negative, positive or zero.
Let be zero () the sea level.
According to the information provided in the exercise, you know that Melissa's location is at 27 meters above the sea level.
Therefore, you can conclude that the integer that represents her location with respect to sea level, is greater than zero (this means that it is positive).
Then, this is:
Brian's location is 21 meters below sea level.
This indicates that the integer that represents her location with respect to sea level is less than zero (it is negative).
Therefore, this is: