Total expenditures in a country (in billions of dollars) are increasing at a rate of f(x) = 8.56x + 87.25, where x = 0 corresponds to the year 2000. Total expenditures were $1587.52 billion in 2002. a. Find a function that gives the total expenditures x years after 2000. b. What will total expenditures be in 2012? a. What is the function for the total expenditures? F(x) = (Simplify your answer. Use integers or decimals for any numbers in the expression.)