
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
In the Cartesian coordinate system $xOy$, there are points $A(-1, -2)$, $B(2, 3)$, and $C(-2, -1)$.
1. Find the magnitude of $\overrightarrow{AB} + \overrightarrow{AC}$.
2. Let the real number $t$ satisfy $(\overrightarrow{AB} - t\overrightarrow{OC}) \cdot \overrightarrow{OC} = 0$, find the value of $t$.

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