What’s the Real Cost of Sioux Falls Landfill Toxic Waste?

What’s the Real Cost of Sioux Falls Landfill Toxic Waste? Hidden contamination concerns are driving new attention across South Dakota.

What’s the Real Cost of Sioux Falls Landfill Toxic Waste? Hidden contamination concerns are driving new attention across South Dakota.
\( F_9 = 34 \)
\( F_{10} = 55 \)
\( F_{11} = 89 \)
\( F_{12} = 144 \)
\( 144 > 100 \), and \( F_{11} = 89 < 100 \).
So the smallest \( n \) is **12**.
An online learning platform observes that course completion rates follow the logistic model \( C(t) = \frac{1000}{1 + 9e^{-0.2t}} \), where \( C(t) \) is the number of completions after \( t \) weeks. After how many weeks does the number of completions first exceed 900?
Solve \( \frac{1000}{1 + 9e^{-0.2t}} > 900 \)
Divide both sides:
\frac{1000}{900} > 1 + 9e^{-0.2t} \Rightarrow \frac{10}{9} > 1 + 9e^{-0.2t}