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A seagull flying 21 feet above sea level is expressed as t(plus)21 feet. A fish swims the same number of feet below sea level. If sea level is considered to be 0, express the distance that the fish is swimming.

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znk

Answer:

h = -21 ft  

Step-by-step explanation:

Think of this as a vertical number line.

If sea level is zero and the seagull is flying 21 ft above the surface, the bird's height

h = +21 ft

If the fish is 21 ft below the surface, it is swimming at a level

h = -21 ft.

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