b$.$ A four$-$period moving average

c$.$ Exponential smoothing with $=\mathrm{.}30$; use $20$ for week $2$ forecast

$5.$ A cosmetics manufacturer's marketing department has developed a linear trend equation that can be used to predict annual $\frac{?}{\text{b}\text{a}\text{r}}($ Page $127)$ sales of its popular Hand & Foot Cream.

$F_t=80+15t$

where

$F_t=$ Annual sales $(000$ bottles$)$

$t$ is in years

a$.$ Are annual sales increasing or decreasing? By how much?

b$.$ Predict annual sales for year $6$ using the equation.

$6.$ From the following graph, determine the equation of the linear trend line for time$-$share sales for Glib Marketing. Inc.

Annual Sales, Glib Sales, Inc.