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

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

Can you decipher the below rebus?

PBLUESAISNUERSES

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

If we change the South-East direction into North and North-East into West and all others similarly.
Can you find out which direction will be in the place of South-West direction?

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?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

I am a type of word that is spelt incorrectly or used differently, on purpose for humour. What am I?
Hint 1: You can find me in a joke.
Hint 2: I am a play on words.

I’m tall when I’m young, and I’m short when I’m old. What am I?

What does this mean?

CCCCCCC