Problem $3-5($Static$)$

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.

$F_t=80+15t$

where

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

$t=0$ corresponds to $1990$

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

Answer is complete but not entirely correct.

Annual sales are

increasing

by

$320,000$

thousands bottles per year.

b$.$ Predict annual sales for the year $2006$ using the equation.

Answer is complete but not entirely correct.

Annual sales are

$15,000$

thousands of bottles.