Answer:
The additive inverse of plane's height is [tex]- 2900 ft\\[/tex]
Step-by-step explanation:
The additive inverse of any number is a number which when added to the original number gives zero
Thus,
[tex]2,900 + X =0\\X = -2,900\\[/tex]
Thus the additive inverse of plane's height is [tex]- 2900 ft\\[/tex]