Document detailing the geographical and cultural aspects of El Llano and La Llina, focusing on border regions and related topics.

A document titled "El Llano and La Llina: The Borders" with text describing geographical and cultural information about the region, including bullet points and numbered lists.

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1. The effect of N fertilizer on corn yield changes over time and is expressed as an exponential function: Y = 50 * (1 - e^(-0.2t)), where t is time in years.
2. Given that the maximum yield is 50 bushels per acre, determine the number of years required for the yield to reach 90% of its maximum value.
3. Solving the equation 45 = 50 * (1 - e^(-0.2t)) gives t ≈ 11.5 years.
4. The yield reaches 90% of its maximum value after approximately 11.5 years.

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