What does the below image rebus riddle means ?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

What word begins and ends with an E, but has only one letter?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

You are playing a game with your friend Jack. There are digits from 1 to 9. You both will take turn erasing one digit and adding it to your score. The first one to score 15 points will win the game.

Would you want to play first or second?

PS: The sum should be exactly 15.

He runs but never walks. Murmurs, but never talks. Has a bed, but never sleeps. And has a mouth, but never eats?

When we see 2 but call 10?

In the following picture, E is going to slide the object down and as per the terrain and the physics, the round object is going to travel all the way till the end. Now, can you analyze who all people will die when it happens?

In the picture given below, can you find out which digit will take place of the question mark?

In the image below, can you find the value of an angle(y)