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Patterns and Relations
Activity 4: Stadium Walls
15
© 1998 T
EXAS
I
NSTRUMENTS
I
NCORPORATED
6. Now have students determine how many beams are
needed for a length of 57.
Discuss how they found their solutions.
(Some students may find the solution by recognizing
that each number in the right-hand column is obtained
by adding 3 to the previous term, starting with 4.)
7. Show students how the TI-73 may be used to find the
solution in the same manner. You can do this in one of
two ways, with the @ key or with the b key.
a. Using the @ key:
(1) Access the
Set Constant
screen.
- † (above the @ key)
(2) At
C1
, enter the constant.
\
[
(3) Return to the Home screen.
- l
(4) At the Home screen, begin your sequence with
4.
4
@ @ @ and so on
➪
n =
number of counts
b. Using the b key:
At the Home screen, begin your sequence.
b \ [ b b b and so on
(You might discuss the inefficiency of this method
for large numbers.)