What word does this rebus represent?

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What 5-letter word typed in all capital letters can be read the same upside down?

What does does this rebus picture means ?

I add 5 to 9 and get 2. The answer is correct, so what am I?

Cristina was born in 1888. She just had her 30th birthday today how did that happen?

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

You can find some missing letters in the picture. By placing two particular letters in the spaces, you can form a nine lettered word beginning from one of the corners and going clockwise direction to the middle. Can you find out the letters and the word?

What is next number in the pattern below:

131 517 192 123 ?

Can you count the number of triangles inside a triangle?

Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?