Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

In a supermarket, there is an intelligent glass pane before a refrigerating unit. This glass pane allows cherries and apples through it but does not allow grapes and Orange to pass through it.

Can you identify the rule that the glass pane is following?

What goes through cities and fields, but never moves?

Using the clues below, what four numbers am I thinking of?

The sum of all the numbers is 31.
One number is odd.
The highest number minus the lowest number is 7.
If you subtract the middle two numbers, it equals two.
There are no duplicate numbers.

Here is a conversation between a couple who both are software professionals.

Husband: Hey! What is your date of birth?
Wife Replied Angrily: It is 591062400
Husband after doing some calculations replied, "Got It".

What is the DOB of the wife?

Can you make four (4) nines (9) equal 100?

Can you place three balls such that the equation shown in the picture holds true?