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We have obtained the following first-order auto-regressive model in forecasting a time series: Y = 5 + 10t + 0.1t^2+ 0.6 et-1 where et-1

We have obtained the following first-order auto-regressive model in forecasting a time series: Y = 5 + 10t + 0.1t^2+ 0.6 et-1 where et-1 is (observed value - forecast) in the previous period (t-1). If in period 19: observed value = 120 forecast = 100 what is the forecast of demand in time period 20?

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