It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

If,
29 - 1 = 30
9 - 1 = 10
14 - 1 = 15

Based on similar logic, Can you prove that the below algebraic equation is true?
11 - 1 = 10 ?

Can you find out a way through which you can make five squares out of the given figure by moving just six match sticks?

You can win me and lose me but never buy me
You can not eat me and never want to part with me
I can make you cry or bring you joy
I am not a machine and definitely not a toy
You keep me but i am not forever just yours
You might find me in a case or on a shelf next to a vase
I am hard and i am tall if you bump me i am sure to fall
I am made of different materials and am at many events
If your lucky and fight hard I might be yours
What am I ?

What Does this text mean:

important=important

Can you make a six-letter word using the letters N, A and B ?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

1 dollar = 100 cent
= 10 cent x 10 cent
= 1/10 dollar x 1/10 dollar
= 1/100 dollar
= 1 cent

=> 1 dollar = 1 cent

solve this tricky problem?

The dirtier I get, the whiter I look. Who am I?

I have an eye but still cannot see.

Who am I?