SAT Scores by Income The following bar graph shows U.S. critical reading S...

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

These data can be modeled by

S(x) = 550 − 136(0.985)^x ,

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