As you ride the Ferris wheel, your distance from the ground varies sinusoidally with time. Let t be the number of seconds that have elapsed since the Ferris wheel started and let d be the number of metres you are from the ground. Assume that you start the ride at the bottom of the Ferris wheel, which is 1.1 metres from the ground. The wheel makes a revolution once every 33 seconds. The diameter of the wheel is 40 metres. What is your height above ground when you have been riding for 7 seconds? Round your answer to the nearest whole number.