1. -23
2. -9
3. -7
4. +22
5. +7

1 is WRONG. Since +23 = 010111 (first digit must be a zero, in 2's complement), how can -23 = 10111? Hint: the value represented by 10111 is the negative (since the leading bit is a 1) of the 2's complement of 10111.

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