Question

a pelican. starts at 60 feet above sea level.it descends 60 feet to a catch fish. how do I explain it

Answer 1

The pelican was at 60 feet above sea level, by descending 60 feet the pelican caught the fish at sea level.

Answer 2

The Pelican who is 60 feet above sea level is represented by +60.Now, he is trying to catch the fish which is at 0 level, means Sea level because the pelican is trying to catch the fish by descending 60 feet.

To explain this

We will take the help of Integers by representing it on the number line.

We will represent sea level by Integer 0.

 ⇒60 feet above sea level= +60

⇒60 feet Below = -60

Now,⇒ 60 + (-60)=0

⇒Also, 60 and -60 are additive inverses of each other, when added together yield additive Identity which is "0" for group of Integers.

→0=Sea Level