What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

Can you solve the below geography rebus by decoding the below rebus ?

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?

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?

Can you find out the next digit in the following series ?

0, 0, 1, 3, 2, 6, 3, 9, 4, 12, 5, ?

I am the beginning of everything, the end of everywhere. I'm the beginning of eternity, the end of time and space. What am I?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

Take one out and scratch my head, I am now black but once was red. What am I?

This is a simple one. You just have to count the number of Fs in the given sentence.

Finished Files are the result of years of scientific study combined with the experience of years.

How many did you count?

If EELS + MARK + BEST + WARY = EASY

What does HELP + BARK + WARD + LEAD equal?