Tides are cyclical phenomena caused by the gravitational pull of the sun and the moon. on a particular retaining wall, the ocean generally reaches the 2.1 m mark at high tide. at low tide, the water reaches the 0.8 m mark. assume that high tide occurs at 12: 00 p. m. and at 12: 00 a. m., and that low tide occurs at 6: 00 p. m. and 6: 00 a. m. what is the height of the water at 9: 30 a. m.?