Respuesta :
Given:
A dolphin was swimming 7 meters below the surface of the ocean.
It located a squid and dove down 4 more meters to eat it.
Lamar subtracted – 7–( – 4) and came up with an answer of – 3 meters.
To find:
The location of the dolphin now relative to the surface and check whether  Lamar is correct or not.
Solution:
A dolphin was swimming 7 meters below the surface of the ocean.
Location of the dolphin relative to the surface = -7
Here, negative sign represents the direction below the surface.
It located a squid and dove down 4 more meters to eat it.
Dove down = -4
Location of the dolphin now relative to the surface = -7+(-4)
                                           = -7-4
                                           = -11
Therefore, the location of the dolphin is 7 meters below the surface of the ocean and Lamar is not correct. She subtracts -4 instead of adding it.
