Final answer:
The general expression for the nth term in the sequence is -1/n².
Step-by-step explanation:
The given sequence is -1, -1/4, -1/9, -1/16, -1/25, -1/36, ....
From the pattern, we can see that the denominator is the square of each term's position in the sequence. So, the general expression for the nth term in the sequence is -1/n².