Height H, in feet, of water at the boating dock t hours after 6 PM is provided by the given equation. Determine height of water at dock at 9 PM, that same day. H = 12 + 2 sin (30 degree t) at the certain time of day, angle of elevation of sun is 32 degrees. To nearest foot, determine height of tree whose shadow is 40 feet long. 75 ft 34 ft 25 ft 21 ft another answer