Can you identify the hidden rebus in the image below?

I can write cow in 13 letters.

Can You?

How many sides does a circle have?

I come in different shapes and sizes.
Parts of me are curved, other parts are straight.
You can put me anywhere you like,
but there is only one right place for me.
What am I?

In a kingdom, King George did not allow any citizen to visit the world outside. Also, only a person with proper paperwork was allowed to enter or he was sent back. A wooden bridge was what connected the kingdom to the world. The king had appointed a sharpshooter who would check the every five minutes on the bridge to check. After checking, he would go back to his hut and return exactly after five minutes again. The bridge took 9 minutes to cross.

A merchant was able to escape the kingdom without harming the shooter. How?

Why do people go to bed?

The measurement of time, That can't be found on a clock, But can be looked upon on a map.

Who is He ?

A patient was diagnosed with some ailment. He was given five different tablets to take at night at an interval of 15 minutes.

How long will it take the patient to consume all the five tablets?

Prove that the below maths equation is true.

8 + 8 = 91

Can you count the number of quadrilaterals in the picture below?