Answer: 
Step-by-step explanation:
<u>Given equation</u>

<u>Expand the parenthesis and apply the distributive property</u>


<u />
<u>Combine like terms</u>


<u>Subtract 8 on both sides</u>


<u>Divide 2 on both sides</u>


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The difference in the elevation between Mt.Everest and the Dead Sea is 29513 feet
<h3><u>Solution:</u></h3>
Given that,
Elevation of Mt.Everest = 29028 feet
Elevation of the Dead Sea = -485 feet
To find: difference in the elevation between Mt.Everest and the Dead Sea
Therefore,
Difference = Elevation of Mt.Everest - Elevation of the Dead Sea
Substituting the given values, we get
Difference = 29028 - ( - 485)
Difference = 29028 + 485 = 29513
Thus the difference in the elevation between Mt.Everest and the Dead Sea is 29513 feet