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texaschic101
sea level is 0. Anything above sea level is positive. Anything below sea level is negative.

And since this one is 400 ft above sea level, then it is 400 (positive)
BasketballEinstein

Answer:

[tex]\displaystyle 400[/tex]

Step-by-step explanation:

Anything below sea-level [below 0] is negative [−], and anything above sea-level [above 0] is positive [+].

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