of dollars) are increasing at a rate of f(x)=8.52x + 87.24, where x=0 corresponds to the year 2000. Total expenditures were $1581.82 billion in 201 a. Find a function that gives the total expenditures x years after 2000. b. What will total expenditures be in 2016? a. What is the function for the total expenditures? F(x)= (Simplify your answer. Use integers or decimals for any numbers in the expression.) b. In 2016, total expenditures will be $ billion. (Type an integer or a decimal.)