math homework help please

Question

a submarine travaling at 200 meters below the surface of the ocean increases its depth by 45 meters. Adam says that the new location of the submarine is -155 describe an error that would result in the answer he gave.

Answer 1

-200 + -45 = -245, the new depth correctly done

-200 - -45 = -200 + 45 = -155, the depth incorrectly done