Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

Can you Find and name the hidden bird in the picture below ?

Find out a multi-digit number that if multiplied by the number 9 or any of its multiplications products (i.e. 18, 27, 36, 45,..) will result in the multiplication factor repeated (n) number of times.

It is a nine-letter word.
The exact opposite of the phrase "friendly and outgoing"
It contains the word "over".
It starts will a vowel.

What is it?

There is a shop where written:
Buy 1 for $1
10 for $2
100 for $3
I needed 999 and still only paid $3. How could this be financially viable for the shop-keeper?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

In a university, a professor gave a set of three problems to the three brilliant students of his class. See the image for the questions.

John and Jacob are twin brothers. One of them is a liar whereas the other one is a truth-teller.

I called their home number and one of them picked up.
I asked. 'Does John lie?' The person replied with a yes.

Whom did I talk with, John or Jacob?

You are provided with a grid (as shown in the picture). Can you fill the squares with numbers 1-8 in a manner that none of the two consecutive numbers are placed next to each other in any direction (vertically, horizontally or diagonally?)