On October 30, the low tide at Balboa Pier was 0.90 feet and occurred at 1:00 am while the high tide was 5.3 feet and occurred at 6:00 am. The following graph shows the function H = f(t) giving the tides over the course of the day, where t = 0 corresponds to 12:00 am (midnight).
a) Determine the amplitude, period, and horizontal shift (together with direction and function) for H(t).
b) Determine the formula for H(t)