What does this Rebus Picture mean?

Can you decipher the two rows to find the hidden word?

Count the number of lines in the image below ?

When Jack was six years old he hammered a nail into his favourite tree to mark his height. Ten years later at age sixteen, Jack returned to see how much higher the nail was. If the tree grew by five centimetres each year, how much higher would the nail be?

what does the below rebus means?

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

There is a box in which distinct numbered balls have been kept. You have to pick two balls randomly from the lot.

If someone is offering you a 2 to 1 odds that the numbers will be relatively prime, for example
If the balls you picked had the numbers 6 and 13, you lose $1.
If the balls you picked had the numbers 5 and 25, you win $2.

Will you accept that bet?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

Can you name an animal whose killing cannot be performed without spilling your own blood?

In the four images below, can you find the odd one out?