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why does february have 28 days - Network4

📅 May 19, 2026 👤 scraface

May 19, 2026

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📌 \frac{\pi}{12}t - \phi = 0 \Rightarrow t = \frac{12}{\pi} \cdot \phi \approx \frac{12}{\pi} \cdot 1.176 \approx 4.49 \text{ hours}

📌 So the maximum value of $ f(t) $ is $ \boxed{13} $, and it occurs at approximately $ \boxed{4.49} $ hours after midnight, or around 4:29 AM.

📌 Question: A city planner is designing a periodic stormwater drainage system that follows a sinusoidal pattern over the year. The water level is modeled by $ w(t) = 7\sin\left(\frac{\pi}{6}t\right) + 24\cos\left(\frac{\pi}{6}t\right) $, where $ t $ is in months. What is the maximum water level, and when does it first occur?

📌 We combine the expression into a single sine function:

📌 w(t) = R\sin\left(\frac{\pi}{6}t + \phi\right)

📌 where $ R = \sqrt{7^2 + 24^2} = \sqrt{49 + 576} = \sqrt{625} = 25 $

📌 So the maximum water level is $ \boxed{25} $.

📌 To find the first time it occurs:

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