What has to be broken before you can use it?

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

If EELS + MARK + BEST + WARY = EASY

What does HELP + BARK + WARD + LEAD equal?

A mules travels the same distance daily.
I noticed that two of his legs travels 10km and the remaining two travels 12km.
Obviously two mules legs cannot be a 2km ahead of the other 2.

The mules is perfectly normal. So how come this be true ?

I have an eye but still cannot see.

Who am I?

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?

What am I?

What's a single-digit number with no value?

If two's company, and three's a crowd, then whats four and five ?