Answer:
a
Step-by-step explanation:
the balloon was at 595 feet
595
then it dropped 495 feet
525-495= 30
the equals 30 means that it is currently 30 feet above the ground
and if it dropped another 15 feet it would not reach the ground, which is zero, the balloon would still be 15 feet above the ground
30-15= 15
so the balloon never reached zero
