why number 8549176320 is one of a kind?

Can you find out which triangle will have a bigger area among the following?
1. A triangle with sides 300, 400 and 500
2. A triangle with sides 300, 400 and 700

What is the end of everything?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

John was visiting his friend Jacob. He found out that his friend's wife had just killed a burglar in self-defense.
John asks Jacob about what happened and he told that "His wife was watching television when suddenly the bell rang. She thought that it is her husband Jacob but she found the burglar who attacked her instantly and she got so frightened that she killed the burglar immediately with the knife.
John asked the police to arrest his friend's wife. Why?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

What is always in front of you but can’t be seen?

What can go through glass without breaking it?

Which flower has two lips?

John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?