Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

In a concert, Christina is performing a dance show with her group.
At 10:00, she and her crew were dancing in an absolutely straight line. At that time Christina was standing in 4th position from both the front and back end of the row.

What was the size of her crew?

I come in different shapes and sizes.
Parts of me are curved, other parts are straight.
You can put me anywhere you like,
but there is only one right place for me.
What am I?

Count the number of triangles in the below picture?

A deaf and mute man goes to the train station. Tickets for the train are 50 cents each. The man goes to the ticket booth and hands the man inside just a dollar. The man in the booth hands him two tickets.

How did the man in the booth know to give him two tickets without even looking at him?

Can you find the hidden animal in the picture below?

Buy me, smell me or deliver me, I do not change.

Who am I?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

In the picture that is attached with this question, you can find a square which comprises of four little squares inside it. Consider this square to be made with matchsticks. You have to remove two matchsticks such that only two squares remain instead of five.How will you do it ?

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?