Chapter 4 - Exercises - Page 217: 5c

$-1$

The first bit is 1 hence the number is negative. The magnitude bits are $000000001$. We convert magnitude to decimal: $000000001=0\cdot 2^8+0\cdot 2^7+0\cdot 2^6+0\cdot 2^5+0\cdot 2^4+0\cdot 2^3+0\cdot 2^2+0\cdot 2^1+1\cdot 2^0=1$ Apply sign: $-1$