Casio fx-CG10 Advanced Operation Manual page 48

Fostering Advanced Algebraic Thinking with Casio Technology
Sample Solution—Douglas Fir Trees (continued)
A graph or the equations could also be used, but the steps will not be outlined
here.
h. What is the approximate circumference of a tree that is 3 meters tall? 45
meters tall? 150 meters tall?
Table:
Students can choose to scroll through the table of the power regression
equation to approximate for what circumference the height of a Douglas fir
tree is 3, 45, and 150 meters.
In the table, a tree that is 3 meters tall has a circumference between 0 and 1
meter. A tree that is 45 meters tall has a circumference between 3 and 4
meters, and a tree that is 150 meters tall has a circumference between 15 and
16 meters.