which situation decribes opposite quantities that when combined would equal 0

Question

ascends 10,000 feet and the ascends 15,000 feet
ascends 15,000 feet and decends 15,000 feet
ascends 15,000 feet and decends 10,000 feet
ascends 15,000 feet and ascends 15,000 feet

Answer 1

The correct situation that describes opposite quantities that when combined would equal 0 is:

ascends 15,000 feet and descends 15,000 feet.

In this case, the ascent and descent cancel each other out, resulting in a net change of 0 feet.