
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
The sum of the first $60$ terms of an arithmetic sequence is $500$, and the sum of the next $60$ terms is $2900$. What is the first term of the sequence?
A) $-11$
B) $-\frac{34}{3}$
C) $0$
D) $-10$

Present the answer in LaTex format: \boxed{Your answer}
user