Can you name any English verb that becomes its past tense by simply rearranging the alphabets ?

A maths symbol is hidden in the below Bar Graph. Can you decipher it?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

Here is what you have to do. You have to throw a ball as hard as you can but it must return back to you even if it does not bounce at anything. Also, you have nothing attached to the ball. There is no one on the other end to catch that ball and throw it back at you.

How will you do it?

A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

John was going on a jungle trip. He asked his wife to pack something to eat, something to drink and something to burn if he feels cold in the jungle. When John opens the backpack he found just one thing in the bag. What was it?

The dirtier I get, the whiter I look. Who am I?

Find the Goldfish below the given Image.

It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

Andrew sees a very rare bird named "Ruppell's vulture". Soon Andrew was dead. Can you explain the mystery, Mr. Sherlock?