Casio fx-CG10 Advanced Operation Manual page 68

Fostering Advanced Algebraic Thinking with Casio Technology
Sample Solution—Trends in Nightly Rates for Hotels (continued)
From the graph of average nightly hotel rates of Baltimore, as a function of
time in years since 2000, it appears that the rates were increasing between
2000 and 2001, and between 2002 and 2007. The rates decreased between
2001 and 2002, and also began decreasing after 2007.
From the graph of average nightly hotel rates of Charlotte, as a function of
time in years since 2000, it appears as if the rates were increasing between
2000 and 2001, and between 2003 and 2008. The rates decreased between
2001 and 2003, and also began decreasing after 2008.