In Galveston, Texas, the amount of beach available for use depends on the tides. At high tide the water comes farther ashore. There is usually a baseline established so that the changes can be measured. It is known that the low tide occurred at 3 AM and the water was 0.2 feet above the baseline at that time. The water at high tide was at 1.8 feet above the baseline and the time between high tide and low tide was 7.5 hours. Part A: Write an equation that would model this data. Part B: What is the height of the tide at 9 AM? (Make sure to use the math type button to help you type your answers.)