Question: In the summer the activity level of a certain type of lizard varies according to the time of day. A biologist has determined that the

In the summer the activity level of a certain type of lizard varies according to the time of day. A biologist has determined that the activity level is given by the function a(t) = 0.008t³ - 0.288t² + 2.304t + 7, where t is the number of hours after 12 noon. When is the activity level highest? When is it lowest?

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