Set equal to \( -1 \):

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• I. 10
• J. 1
• Rate of change is \( C'(t) = \frac{d}{dt}\left(10(t+2)^{-1}\right) = -10(t+2)^{-2} \).
• \frac{10}{(t+2)^2} = -1 \Rightarrow \frac{10}{(t+2)^2} = 1 \Rightarrow (t+2)^2 = 10
• t+2 = \sqrt{10} \approx 3.16 \Rightarrow t \approx 1.16
• But this does not match any ideal option; recheck algebra. Wait:

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