Explanation

Conversion of binary (101011) to decimal:

Write the binary digits with powers of 2:

1×2⁵ + 0×2⁴ + 1×2³ + 0×2² + 1×2¹ + 1×2⁰

= 32 + 0 + 8 + 0 + 2 + 1

= 43

So, binary (101011) = decimal 43.