The deepest point of the Gulf of Mexico lies approximately 12,400 feet below sea level. What is the integer that best expresses the given number?

1 (x10,000 ft)

This is not an algebra question. it appears to be a "significant figures" question.

The answer is negative 12400

The integer that best expresses the given number, 12,400 feet below sea level, is -12,400.

To express the given number as an integer, you need to round it to the nearest whole number. The given number, 12,400 feet, is already a whole number, so it can be expressed as the integer 12,400.