Question

An airplane is at an elevation of 4,280 ft. It ascends 600 ft. and later descends 1,500 ft. What is its final elevation?

Answer 1

3380 Feet is the final elavation

Answer 2

Add 600 feet to 4,280 feet.  Then subtract 1,500 feet from the resulting sum:

4,280 ft + 600 ft = 4,880 ft

Now subtract 1,500 ft from this 4,880 ft:  3,380 ft (answer:  final elevation)