Set equal to -1:
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- Still not in choices. But perhaps question expects exact form?
- But options are integers. So likely miscalculation.
- Wait — if \( C(t) = 10/(t+2) \), then \( C'(t) = -10/(t+2)^2 \)
- -10/(t+2)^2 = -1 \Rightarrow (t+2)^2 = 10 \Rightarrow t = \sqrt{10} - 2
- But none of the integers satisfy.
- Wait — perhaps question meant \( C(t) = 10t / (t+2) \)? But not stated.
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