Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

I can be cracked, made, told, and played. What am I?

Why Wine Glass Stem is so long?

A man hijacks an aeroplane transporting both passengers(8 of them) and valuable cargo. After taking the cargo, the man demands nine parachutes, puts one of them on, and jumps, leaving the other eight behind. Why did he want eight?

You need to move three matchsticks to form three squares. Can you do it?

A cat had three kittens: Snophy, Topsy and Jorden. What was the mother's name?

I am a type of room you cannot enter or leave. Raised from the ground below, I could be poisonous or a delicious treat. What am I?

I am a five-letter word under you,
Remove the first letter and I am above you,
Remove the second as well and I am around you.

Who am I?

Be active and find the killer in the picture Riddle below.

I look at you, you look at me, I raise my right, you raise your left. What am I?