The depth of the water at the end of a pier changes periodically along with the movement of tides. on a particular day, low tides occur at 12: 00 a. m. and 3: 30 p. m., with a depth of 3.25 meters, while high tides occur at 7: 45 a. m. and 11: 15 p. m., with a depth of 8.75 meters. which of the following equations models d, the depth of the water in meters, as a function of time, t, in hours? let t = 0 be 12: 00 a. m.