Question: Problem asks me: use the observed value for period 101 as the base of a linear trend, and use that linear trend to forecast the

Problem asks me: use the observed value for period 101 as the base of a linear trend, and use that linear trend to forecast the values of stock for periods 101 through 257. Before that, I used the moving average method. I have observed values for 1-252. The value for 101 = $59.49. So I think the formula should be = $59.49 + slope(102-101). When I calculate the slope, do I include only 101-252 period since it wants the base for the linear trend to be the value of 101, or 1-101, or the full period for observed values 1-252? I am doing this in Excel.

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