The height of a sand dune (in centimeters) is represented byf(t) = 800 - 2t^2, where t is measured in years since 2005. Find f(5) and f ' (5). Using units, explain what each means in terms of the sand dune.

f(5) =

f ' (5) =

In the year __________, the sand dune will be _______ cm high and eroding at a rate of ______ centimeters per year.