Patterns and Relations

Activity 4: Stadium Walls

15

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.)

© 1998 TEXAS INSTRUMENTS INCORPORATED