4. Fairly accurate exponential smoothing forecasting models can be built once the salient characteristics of the time series to be forecast are properly identified. Two of these characteristics are and .

smoothing coefficient or base factor, seasonality factor

Step-by-step explanation:

base factor: amount of smoothing that takes place over a period of time

Seasonality factory: the variation within a single period

1.3

step-by-step explanation:

3x2=6   9x+6

bring down the 6 on both sides

6+6=12

12= 9x

divide by 9

12/9 =

1.3 =x