### Home > PC > Chapter 10 > Lesson 10.1.2 > Problem10-30

10-30.

Write a sinusoidal function to represent this situation.

Graph some points from the situation to help you determine its equation. Assume t = 0 is 12:00 a.m.

Set your equation equal to 178 and solve for t.

$y=4\cos\left(\frac{\pi}{5.5}(x-9.333)\right)+182$