Wait — recompute:
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- Wait — maybe the rate is magnitude? But question says "rate of change".
- Alternatively, perhaps the function is \( C(t) = 10e^{-0.05t} \), but it's given as rational.
- Given discrepancy, but to align with format, assume typo in setup — perhaps intended answer is 2? But inaccurate.
- \frac{dC}{dt} = -10/(t+2)^2 = -1 \Rightarrow (t+2)^2 = 10 \Rightarrow t = \sqrt{10} - 2 \approx 1.16
- \text{No match.}
- But perhaps the question meant: when does \( C(t) = 1 \)? Then \( 10/(t+2) = 1 \Rightarrow t = 8 \). Not matching.
