A certain region is losing about 24 million acres of rain forest each year.
(a) Find a linear function f that calculates the change in acres of rain forest in millions in x years. Type an expression using x as the variable f(x)=? (Type an expression using x as the variable.)
(b) Find f(4)=? (Simplify your answer.) and interpret the result ( After ? years, the region can expect to have lost about ? million acres of rain forest.