This is a pre calculus exercise

16. [-/1 Points] DETAILS SPRECALC7 5.6.045. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A certain bay with very high tides displays the following behavior. In one 12-h period the water starts at mean sea level, rises to 13 ft above, drops to 13 ft below, then returns to mean sea level. Assuming that the motion of the tides is simple harmonic, find an equation that describes the height of the tide in this bay above mean sea level. (Let y be the height above sea level in feet, and t the number of hours since the start of the 12-h period.) Sketch