
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
Jeff's four assignment scores are 85, 90, 87, and 93. He forgot one of his scores, but remembers that the arithmetic mean of all five scores is 89. What was the missing score?

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