Using Only Five 5's and any mathematical operator make sum as 37

I am an odd number. Take away a letter and I become even. What number am I?

In the image given, you can find several triangles. Can you count them all?

You measure my life in hours
I serve you by expiring
I vanish faster when I am thin
and slower when I am thick
The wind is my energy
What am I?

Decode the movie name from the below picture?

What type of tree can I carry in my hand?

A horse was tied to a rope 5 meters long and the horses food was 15 meters away from the horse. How did the horse reach the food?

What is at the end of a rainbow?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

One night, a woman receives a call from the police. They tell her that her husband was murdered and that she should come to the crime scene as soon as possible. The woman drops the phone, shocked, and drives 20 minutes to the crime scene. As soon as she reaches the crime scene, the police arrest her and she is convicted of murder. How do the police know she committed the crime?