I have teeth but i don't bite. Who Am I ?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

I have Rs.50 and I spend it in the way as below.

Can you find a rabbit in the given picture?

Can you find the key in the picture below?

Sherlock breaks into a crime scene. The victim is the owner who is slumped dead on a chair and have a bullet hole in his head. A gun lies on the floor and a cassette recorder is found on the table. On pressing the play button, Sherlock hears the message 'I have committed sins in my life and now I offer my soul to the great Lord' and followed a gunshot Sherlock smiles and informed the police that's its a murder.

Why did he think so?

Three fair coins are tossed in the air and they land with heads up. Can you calculate the chances that when they are tossed again, two coins will again land with heads up?

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

A landlord calls both of his sons and tells them that their horses will now decide who will transfer the inheritance. He tells them to race along the land till the end and the one whose horse will be slower will win and be the heir to all the property.

Both of them keep wandering for days but to no result. Then they ask a wise man regarding it. The man advises them on the matter after which they jump on the horses and race as fast as they can till the end. Why did they do it?

What did the wise man say?

using four eights (8) and a one (1) and one mathematical symbol , create the number 100