Answer:
The binary number 10011011 is equivalent to the the decimal number 155.
Explanation:
You can solve this by looking at each bit as a multiple of a power of two, starting at 2⁷ and descending:
10011011 ≡ 1 × 2⁷ + 0 × 2⁶ + 0 × 2⁵ + 1 × 2⁴ + 1 × 2³ + 0 × 2² + 1 × 2¹ + 1 × 2⁰
= 128 + 16 + 8 + 2 + 1
= 155
