The Tonga Trench is at an elevation of 35,702 feet below sea level. The South Sandwich Trench is at an elevation of 23,737 feet below the sea level.

The elevation of Tonga Trench can be expressed as a rational number as

feet. The elevation of the South Sandwich Trench can be expressed as a rational number as

feet.

-35 702 ft; - 23 737 ft

Step-by-step explanation:

If sea level is defined as 0 ft, then depths below sea level are negative quantities.

The elevation of the Tonga Trench is - 35 702 ft.

The elevation of the South Sandwich Trench is - 23 737 ft.

A rational number is a number that can be obtained by dividing two integers.

-35 702 = 35 702 / (-1)

-23 737 = 23 737 / (-1)

Both numbers are rational.