What Deficiency does the below rebus represent?

VIT_MIN

Buy me, smell me or deliver me, I do not change.

Who am I?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

A mathematician couple was having a Frappuccino in Starbucks sitting opposite to each other. Suddenly the guy noticed the text written on the paper in front of them and exclaimed that it was wrong. The girl denied it and said it is appropriate. Both are correct. What is written on the paper?

A bank customer had $100 in his account. He then made 6 withdrawals. He kept a record of these withdrawals, and the balance remaining in the account, as follows:

Withdrawals Balance left
$50 $50
$25 $25
$10 $15
$8 $7
$5 $2
$2 $0
----- -----
$100 $99

Why are the Totals not tallying?

What number comes next in this sequence:
7 8 5 5 3 4 4 _

Solve the following series:
AZ, GT, MN, __, YB

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

What does it mean?