Chapter 2 - The Logic of Compound Statements - Exercise Set 2.5 - Page 94: 11

$71$

$1000111_{2} = ((1 \times 2^{6}) + (0 \times 2^{5}) + (0 \times 2^{4}) + (0 \times 2^{3}) + (1 \times 2^{2}) + (1 \times 2^{1}) + (1 \times 2^{0}))_{10} = ((1 \times 64) + (0 \times 32) + (0 \times 16) + (0 \times 8) + (1 \times 4) + (1 \times 2) + (1 \times 1))_{10} = 71_{10}$