Final answer:
The value of the 12th term of the arithmetic sequence is -78.
Step-by-step explanation:
The explicit rule for an arithmetic sequence is given by the formula f(n) = -7n + 6. To find the 12th term of the sequence, we substitute n = 12 into the formula:
f(12) = -7(12) + 6 = -84 + 6 = -78
Therefore, the value of the 12th term is -78.