3-5 Solve It!
Be careful! Your
phone chooses
from a lot of
combinations.
Most numbers on a telephone keypad correspond to a
set of letters. Suppose you’re sending a text message.
You press 4, 6, 6, and 3, in that order—one number
for each letter. What word might your telephone think
you’re trying to spell? What words could you be trying to
spell? Explain your reasoning.
1
4
GHI
7
PQRS
*
2
ABC
5
JKL
8
3
DEF
6
MNO
9
TUV
WXYZ
0
#
+
3-5 Lesson Quiz
1. How do you write “S is the set of natural numbers that are
less than 8” in roster form?
2. In set-builder notation, how do you write the solutions of
2x 2 7 $ 11?
3. What are all the subsets of the set {7, 8, 9}?
4. Suppose U 5 {1, 2, 3, 4, 5} is the universal set and A 5 {1, 5}.
What is Ar?
5. Do you UNDERSTAND? Given that the universal set
U 5 {baseball, basketball, football, tennis ball, soccer ball,
volleyball} and that set A is the set of sports balls that are
spherical, what is the complement of set A?
Answers
0194_hsm11a1se_0305.indd 194
1/29/09 5:04:38 PM
Solve It!
Lesson Quiz
Answers may vary. Sample:
home; gone, hoof, good, goof,
home, hone, hood; explanations
may vary.
1. {1, 2, 3, 4, 5, 6, 7}
2. {x | x $ 9}
3. { }, {7}, {8}, {9}, {7, 8}, {8, 9},
{7, 9}, {7, 8, 9}
4. Ar 5 {2, 3, 4}
5. Ar 5 {football}
Prentice Hall Algebra 1 • Solve It/Lesson Quiz on Transparencies
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