Sequence Graphing - Texas Instruments TI-89 Titanium Short User Manual

Steps and keystrokes
5. Select
ZoomSqr
equation.
increases the range along the
ZoomSqr
x axis so that the graph is shown in correct
proportion.
Press „ 5
You can change values for A and B as
necessary and regraph the equation.

Sequence Graphing

A small forest contains 4000 trees. Each year, 20% of the trees will be
harvested (with 80% remaining) and 1000 new trees will be planted.
Using a sequence, calculate the number of trees in the forest at the end of
each year. Does it stabilize at a certain number?
Initially After 1 Year
4000 .8 x 4000
+ 1000
Steps and keystrokes
1. Display the
mode, select
Press 3 B 4 ¸
Previews
, which regraphs the
After 2 Years
.8 x (.8 x 4000 +
1000) + 1000
dialog box. For
MODE
.
SEQUENCE
Display
After 3 Years
.8 x (.8 x (.8 x
4000 + 1000) +
1000) + 1000
Display
Graph
. . .
. . .
59