What is the next number in this matchsticks series riddle?

Which five letter word can be added at the end of below word to form a
valid word?

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I am the fastest animal but cannot climb the tree. What am I?

Christina is practising her dance steps along with her friends. In a particular sequence, all of them form a row. At that point, Niharika is standing in the 4th position from either end of the row.
Can you find out how many girls are practising together?

What word does this rebus represent?

meta meta
meta meta

John is selling fruits.
He sells grapes at $30, Dates $25, and a Wolfberry $45.
At what price does he sell fig?

PS: Logical Thinking

How can a man go eight days without sleep?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

Can you make four (4) nines (9) equal 100?

Using the clues below, what four numbers am I thinking of?

The sum of all the numbers is 31.
One number is odd.
The highest number minus the lowest number is 7.
If you subtract the middle two numbers, it equals two.
There are no duplicate numbers.