Can you solve this picture maths equation?

What is always in front of you but can’t be seen?

One absent-minded ancient philosopher forgot to wind up his only clock in the house. He had no radio, TV, telephone, internet, or any other means for telling time. So he travelled on foot to his friend's place a few miles down the straight desert road. He stayed at his friend's house for the night and when he came back home, he knew how to set his clock. How did he know?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

There are two beautiful yet remote islands in the South Pacific. The Islanders born on one island always tell the truth, and the Islanders from the other island always lie.
You are on one of the islands and meet three Islanders. You ask the first which island they are from in the most appropriate Polynesian tongue, and he indicates that the other two Islanders are from the same island. You ask the second Islander the same question, and he also indicates that the other two Islanders are from the same island.
Can you guess what the third Islander will answer to the same question?

I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?

A donkey is behind another donkey
I'm behind that second donkey
But there is a whole nation behind me

It is a murder you can describe in a word.

There is a place where if I stand up straight, I will still be considered sideways.