Download Text Messaging – Performance Task The keypad on Suki`s cell

Name: _________________________
Algebra Blizzard Bag #6
Text Messaging – Performance Task
The keypad on Suki’s cell phone is shown at right. As you can
see, there is a relationship between the letters and numbers.
When Suki writes a text message, she thinks of the letter in the
word she is typing and presses the correct numbered key.
1
ABC
2
DEF
3
GHI
4
JKL
5
MNO
6
PQRS
7
TUV
8
WXYZ
9
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1. Complete this table to show the relation from letter to number.
Letter Number
Letter Number
A
2
H
B
2
I
C
2
Letter Number
Letter Number
D
E
F
G
2. What is the domain of this relation?
_____________________________________
3. What is the range of this relation?
_____________________________________
4. Is the relation from letter to number a function? Explain.
________________________________________________________________________________________
5. If Suki writes the word “Hello,” what sequence
of numbers does she press?
_____________________________________
After Suki presses the numbered keys, the microchip within her
cell phone must decide what letters to show on the screen. Consider
the relation from number to letter.
6. What is the domain of this relation?
_____________________________________
7. What is the range of this relation?
_____________________________________
8. Is the relation from number to letter a function? Explain.
________________________________________________________________________________________
9. List the possible three-letter combinations the phone
could show on the screen after Suki presses 3 6 4. _____________________________________
________________________________________________________________________________________
________________________________________________________________________________________
10. Suki’s phone uses predictive text messaging, which means that it “guesses” what word she meant to type.
Which three-letter word in problem 9 do you think the
phone will guess?