SAT Scores by Income The following bar graph shows U.S. math SAT scores as...

SAT Scores by Income The following bar graph shows U.S. math SAT scores as a function of household income:

These data can be modeled by

S(x) = 573 − 133(0.987)^x ,

where S(x) is the average math SAT score of students whose household income is x thousand dollars per year. Numerically estimate lim_x→+∞ S(x) and interpret the answer.