The water level in a harbor is described by the function y = 7 cosine (pix/6) + 25, where y represents the water level measured in feet, and x represents the number of hours since high tide. The period of time between high tides is 12 hours. After approximately how many hours is the water expected to reach a depth of 28 feet the second time? Round to the nearest hour. DO NOT JUST WRITE THE ANSWER, PLEASE PROVIDE EXPLANATION