Chapter 6: Sequence Graphing; Getting Started: Forest And Trees - Texas Instruments TI-84 PLUS - Graphing Calculator Manual Book

Chapter 6:
Sequence Graphing

Getting Started: Forest and Trees

Getting Started is a fast-paced introduction. Read the chapter for details.
Note:
A small forest of 4,000 trees is under a new forestry plan. Each year 20 percent of the trees will be
harvested and 1,000 new trees will be planted. Will the forest eventually disappear? Will the forest
size stabilize? If so, in how many years and with how many trees?
1. Press z. Press † † † ~ ~ ~ Í to select
graphing mode.
Seq
2. Press y . and select
and format if necessary.
ExprOn
3. Press o. If the graph-style icon is not ç (dot),
press | |, press Í until ç is displayed, and
then press ~ ~.
4. Press  ~
to select
3
because only whole trees are harvested. After
each annual harvest, 80 percent (.80) of the trees
remain.
Press Ë y
8 [u]
number of trees after each harvest. Press Ã
¤ to define the new trees. Press †
the number of trees at the beginning of the
program.
: Be sure to press y
Note
the second function of the ¬ key.
5. Press p
to set
0
. and
nMax=50 nMin
50 years. Set the other window variables.
PlotStart=1 Xmin=0
PlotStep=1 Xmax=50 Ymax=6000
Xscl=10
axes format
Time
(integer part)
iPart(
£ „ ¹ ¤ to define the
1
4000
, not t
[u]
. Press †
nMin=0 50
evaluate forest size over
nMax
Ymin=0
Yscl=1000
1000
to define
. is
[U] [u]
to set

Chapter 6: Sequence Graphing

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