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

2 is CORRECT. Since 10111 is specified to be in 2's complement form, the leading 1 indicates that the number which this code represents must be negative; the positive number corresponding to 10111 may be obtained by computing the 2's complement of 10111 as follows: 2's[10111] = 01000+1=01001 = +9 Conclusion: 10111 = -9, because it is actually negative.

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