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9. An airplane descended 4,000 feet before landing. The integer that represents how many feet the airplane was above the ground before its descent is??​

Respuesta :

idiot8528
And the distance above the ground is represented by the positive integers and distance below the ground is represented by the negative integers. Since, 4,000 feet is the distance of airplane above the ground. So, the airplane was +4,000 feet above the ground before its descent.

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