Write two equivalent expressions that represents the situation. what is the difference in their elevations? and airplane flies an altitude of 25,000 feet. a submarine a diverse to a depth of 600 feet below sea level.

Hₐ (airplane) =  H₀ +25,000

Hₐ (submarine) =  H₀ -600

Difference in elevation = 25,600 ft

Step-by-step explanation:

Let the reference point  be Sea level

Let the Height at sea level = H₀

Let the height above or below sea level = H₁

Total Height  with respect to sea level = Hₐ

Hₐ =H₀ ±  H₁ (1)

Where:  

(+) is used for height above sea level

(-) is used for height below sea level    

For the airplane :

Hₐ (airplane) =H₀ + H₁

    = H₀ + 25,000 (2)

For the Submarine;

Hₐ (submarine)  =H₀ - H₁

    =H₀ -600

Summarily:

Hₐ (airplane) =  H₀ +25,000

Hₐ (submarine) =  H₀ -600

H₀ is common in both expressions for the respective heights. The difference  in elevation is given by :

Hₐ (airplane) -Hₐ (submarine) =   (H₀ +25,000 ) -(H₀ -600)

                                                = 25,600 ft

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