Why is addition used to represent the submarine’s position changing from －8 feet to 0 feet below sea level?
What integer represents a submarine 8 feet below sea level?
What integer represents a submarine rising 8 feet?

Addition is used because the position goes from below sea level (used as negative numbers) to above sea level (positive numbers) As the submarine goes up towards the sea level, the value increases

-8ft (below from sea level)

8ft (above from sea level)

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