How is the sign of a number determined in two's complement?

How is subtraction performed using two's complement?

Why is two's complement used instead of sign-magnitude representation?

What is the purpose of two's complement?

What happens if both the leftmost bit and the remaining bits are zero in sign and magnitude representation?

What is the advantage of sign and magnitude representation?

Which bit is flipped when finding two's complement of a binary number?

Which of the following operations can be easily performed in two's complement?