During a recent period of time, bookstore sales have been declining.
The sales (in billions of dollars) can be modeled by
the function f(t) = -7/5+ 17.2, where t is the number
of years since 2006. Suppose sales decreased at twice
the rate. How can you transform the graph off to
model the sales? Explain how the sales in 2010 are
affected by this change.

Algebra 2