The length of time between consecutive high tides is 12 hours and 25 minutes. According to the National Oceanic and Atmospheric Administration, on Saturday, July 25, 2009, in Sitka Sound, Alaska, high tide occurred at 2:37 AM (2.6167 hours) and low tide occurred at 9:12 PM (9.2 hours). Water heights are measured as the amounts above or below the mean lower low water. The height of the water at high tide was 11.09 feet, and the height of the water at low tide was -2.49 feet.

(a) Approximately when will the next high tide occur?

(b) Find a sinusoidal function of the form y = A sin(ωx – ϕ) + B that models the data.

(c) Use the function found in part (b) to predict the height of the water at 6 PM.