(a) Fit three trends (linear, quadratic, exponential) to the time series. (A negative value should be indicated by a minus sign. Do not round the intermediate calculations. Round your final answers to 2 decimal places.) Linear yt = 774.06 X+ + 6.36 Quadratic yt = X+ X+ + Exponential yt = X (b) Use each of the three fitted trend equations to make numerical forecasts for the next three years. (Round the intermediate calculations to 2 decimal places and round your final answers to 1 decimal place.) it Linear Exponential Quadratic 9 10 11