The notation \( 1D(16) = (10) \) appears to relate to number bases.
In this context, \( 1D \) is interpreted in hexadecimal (base 16). The letter "D" in base 16 represents the decimal number 13. Therefore, \( 1D \) in base 16 translates to:
\[ 1 \times 16^1 + 13 \times 16^0 = 16 + 13 = 29 \]
So, \( 1D(16) = 29(10) \).
If you meant something else or have further questions, please provide additional context!