Try \( C(t) = \frac{10}{(t/2 + 1)} = \frac{20}{t+2} \)? Then \( C' = -20/(t+2)^2 \). Set = -5: \( (t+2)^2 = 4 \Rightarrow t = 2 \).

Sun, 19 Apr 2026 06:21:49 +0000

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