Find the mistake in the below maths equations

A = 2
A(A-1) = 2(A-1)
A2-A = 2A-2
A2-2A = A-2
A(A-2) = A-2
A = 1

Find out which of the given views in the picture is accurately the top view of the given pyramid.

Can you find the largest Three-digit number whose sum is 14 and whose square is less than 5,00,000?

What is common among 11, 69, and 88?

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

15 caves are arranged in a circle at the temple of doom. One of these caves has the treasure of gems and wealth. Each day the treasure keepers can move the treasure to an adjacent cave or can keep it in the same cave. Every day two treasure seekers visit the place and have enough time to enter any two caves of their choice.

How do the treasure seekers ensure that they find the treasure in the minimum number of possible days?

There was a competition where the contestants had to hold something. At the end of the event, the winner was a person who had no hands or feet. What was it that the contestants had to hold?

Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=

I am a type of word that is spelt incorrectly or used differently, on purpose for humour. What am I?
Hint 1: You can find me in a joke.
Hint 2: I am a play on words.

I can be made.
I can be cracked.
I can be told.
I can be played.

Who am I?