No typo. Try each option:
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- Wait — perhaps solve:
- \frac{10}{(t+2)^2} = 1 \Rightarrow t+2 = \sqrt{10} \Rightarrow t = \sqrt{10} - 2 \approx 3.16 - 2 = 1.16
- Still not matching. But perhaps error? Wait — reconsider:
- \( t=2 \): \( (2+2)^2 = 16 \), \( 10/16 = 0.625 \) → rate = -0.625
- \( t=1 \): \( (3)^2 = 9 \), \( 10/9 ≈ 1.111 \) → close
- But no option gives -1.
