How smart are you?????

It's a quiz where you answer questions 'n' stuff.

1 what's 9 times 9 divided by the square root of the sum of all the numbers in John Lennon's birth date?
2 What is the scientific name of a zeba?
3 Can I have your number?
4 What country has the highest population in the world?
5 What planet has the largest population?
6 Name one ingredient used to make the world's most expensive pizza.
7 What is the name of the app. I made his quiz on?