Traffic accidents per month at a busy intersection have decreased since a traffic light was installed. The number of accidents per month at the intersection can be modeled by A(t) = −0.17t3 + 2.22t2- 9.46t + 82.83, where t is the number of months after the light was installed and 0 ≤ t ≤ 12. When was the rate of decrease in the number of accidents at its maximum?
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