Evaluate each expression for the given value of the variable.
Money
11. 3h 2 for h 10
12. 2x2 for x 3
13. t 7 for t 20
14. 4p 3 for p 20
c
15. 7 for c 56
16. 10 2r for r 5
17. 3x 17 for x 13
18. 5p for p 12
19. s2 15 for s 5
20. 14 2c for c 2
21. 10x for x 11
22. 4j 12 for j 9
23. Money The zloty is the currency in Poland. In 2005, 1 U.S. dollar was
worth 3 zlotys. How many zlotys were equivalent to 8 U.S. dollars?
24. Use the graph to complete the
table.
Cups
of Water
Lemonade
Number of large
lemons
Why does a Polish
coin show Australia
and a kangaroo?
This coin honors
Pawel Edmund
Strzelecki, a Pole
who explored and
mapped much of
Australia.
Number
of Lemons
8
12
16
60
48
36
24
12
0
4
w
8
12
16
Cups of water
KEYWORD: MR7 Money
25. What’s the Error? A student evaluated the expression x 2 for x 14 and
gave an answer of 28. What did the student do wrong?
26. Write About It How would you evaluate the expression 2x 5 for
x 1, 2, 3, and 4?
27. Challenge Using the algebraic expression 3n 5, what is the smallest
whole-number value for n that will give you a result greater than 100?
28. Multiple Choice Evaluate 8m 5 for m 9.
A
67
B
83
C
84
D
94
29. Gridded Response Evaluate the expression 4p 18 for p 5.
Write each expression in exponential form. (Lesson 1-3)
30. 3 3 3
31. 5 5 5 5 5 5
32. 10 10 10 10
Choose a solution method and solve. Explain your choice. (Lesson 1-6)
33. Al earns $16 per hour for his work at a factory. He works 32 hours per week
and gets paid every 2 weeks. If the factory takes $105 out of each check for taxes,
how much money will Al be paid?
2-1 Variables and Expressions
57