The graph shows dollars (in billions) spent for general science and for space/other technologies in selected years. G(x) represents the dollars spent for general science, and S(x) represents the dollars spent for space and other technologies. T(x) represents the total expenditures for these two categories. Use the graph to estimate (T - S)(2000). What does this function represent? AY 28 24 T( 20 16 36+ 12 8 4 0 1 9'90 1995 2000 2005 9,0 Estimate (T S)(2000). (T- S)(ZOOO) = :| (Type a whole number.) It represents the dollars in billions spent for