To solve the equation \( 15 \times 34 - 31 = -6 \), we first calculate \( 15 \times 34 \).
\[ 15 \times 34 = 510 \]
Then we subtract 31 from 510:
\[ 510 - 31 = 479 \]
Now we check if \( 479 = -6 \). Clearly, this equation does not hold true, indicating that the equation \( 15 \times 34 - 31 = -6 \) is incorrect.
However, the question seems to be asking for the correct answer, possibly suggesting that some response is linked to a different question or context. From the responses given (25, 5, 625, 125), none seem to relate directly to the calculation we performed.
Please clarify or provide more context to help identify the correct answer.