Chapter 6: Sequence Graphing 153
3. Press o. If the graph-style icon is not ç (dot),
press ||, press Í until ç is displayed, and
then press ~~.
4. Press ~
3 to select iPart( (integer part)
because only whole trees are harvested. After
each annual harvest, 80 percent (.80) of the trees
remain.
Press Ë
8 y [u] £ „ ¹ 1 ¤ to define the
number of trees after each harvest. Press Ã
1000
¤ to define the new trees. Press †
4000 to define
the number of trees at the beginning of the
program.
5. Press p
0 to set nMin=0. Press † 50 to set
nMax=50. nMin and nMax evaluate forest size over
50 years. Set the other window variables.
PlotStart=1 Xmin=0 Ymin=0
PlotStep=1 Xmax=50 Ymax=6000
Xscl=10 Yscl=1000
6. Press r. Tracing begins at nMin (the start of
the forestry plan). Press ~ to trace the sequence
year by year. The sequence is displayed at the top
of the screen. The values for
n (number of years),
X (X=n, because n is plotted on the x-axis), and Y
(tree count) are displayed at the bottom. When will
the forest stabilize? With how many trees?
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