The height of the tide in a small beach town is measured along a seawall. Water levels oscillate between 7 feet at low tide and 15 feet at high tide. On a particular day, low tide occurred at 8:00 AM and high tide occurred at 2:00 PM. Graph a function that models that situation for one full day, starting at midnight and ending at midnight on the following day. Make sure to show and label all key features.