Final answer:
To find the distance between the airplane and the submarine, subtract the altitude of the submarine (850 meters below sea level) from the altitude of the airplane (900 meters above sea level), resulting in 1750 meters.
Explanation:
900 meters above sea level represents a positive value on the number line, while 850 meters below sea level can be represented as a negative value.
To find the distance between the airplane and the submarine, we calculate the difference between the two positions on the number line:
900 meters - (-850 meters) = 900 meters + 850 meters = 1750 meters.
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