The water level at a pier is modeled by the function y = 2.5 cosine (startfraction 2 pi over 12.5 endfraction x) 12, where y represents the water level measured in meters, and x represents the number of hours since the last high tide. after how many hours is the water first expected to reach a depth of 12 meters? round to the nearest tenth of an hour. 1.6 hours 3.1 hours 14.4 hours 19.6 hours