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