Problem 3-5 A cosmetics manufacturer's marketing department has developed a linear trend equation that can be used to predict annual sales of its popular Hand & Foot Cream. Ft = 80 + 11t where Ft = Annual Sales (000 bottles) t = 0 corresponds to 1990 a. Are annual sales increasing or decreasing? By how much? Annual sales are by thousands bottles per year. b. Predict annual sales for the year 2006 using the equation. Annual sales is thousands of bottles.