What is the next number in this matchsticks series riddle?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

It's a 7-letter word.
If we remove 1 letter from it, it remains the same.
If we remove 2 letters from it, it remains the same.
If we remove 3 letters from it, it remains the same.
If we remove all the letters from it, still it remains the same.
What is it?

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.

I am green and found in the forest and have needles instead of leaves. What am I?
Hint 1: It can be used for Christmas decorations.
Hint 2: I have a strong, scent that is used in air fresheners.

When I asked a girl's name she told me her name is the date '07/09/2001'.

I thought for a few seconds and then I got her name. Do you?

What Adam and Eve do not have but the rest of the people have?

Can you count the number of triangles in the given figure?