From the deck of a cape fear steamboat, you watch a point on the blade of the paddlewheel as it rotates. the point's distance (d) from the surface of the water can be modeled using a function we have discussed. after three seconds the point on the wheel is at its highest, 16 feet above the surface of the water. the diameter of the wheel is 18 feet, and a complete revolution takes 12 seconds. what is the equation for this model?