1. Functions Review: 8.1 through 8.4 Sprint Relay
Mid-Chapter 8 REVIEW
Functions Review: 8.1 through 8.4
Sprint Relay

2. Complete the function table.1 2

3. ANSWER:

4. Complete the function table.

5. ANSWER: 15
15 – 3
(15, 12) 18
18 – 3
(18, 15) 20
20 – 3
(20, 17)

6. Complete the function table.

7. ANSWER: 1
2(1) + 2
(1, 4) 2
2(2) + 2
(2, 6) 3
2(3) + 2
(3, 8)

8. Use words and symbols to describe the value of each term as a function of its position. Find then find the value of the tenth term in the sequence.
WORDS:
RULE:
10th TERM:

9. Use words and symbols to describe the value of each term as a function of its position. Find then find the value of the tenth term in the sequence.
ANSWER:
WORDS: subtract 3
RULE: n – 3
10th TERM: 10 → 10 – 3 → 7

10. Use words and symbols to describe the value of each term as a function of its position. Find then find the value of the tenth term in the sequence.
WORDS:
RULE:
10th TERM:

11. Use words and symbols to describe the value of each term as a function of its position. Find then find the value of the tenth term in the sequence.
ANSWER:
WORDS: multiply by 5
RULE: 5n
10th TERM: 10 → 5(10) → 50

12. Complete the function table by finding the rule.

13. ANSWER:
x + 12
2 + 12
4 + 12
6 + 12
8 + 12

14. Complete the function table by finding the rule.

15. ANSWER:
11x
11(1)
11(2)
11(3)
11(4)

16. Describe the rule. Name the rule as an expression
Describe the rule. Name the rule as an expression. Write the equation to represent the function.

17. Describe the rule. Name the rule as an expression
Describe the rule. Name the rule as an expression. Write the equation to represent the function.
ANSWER:
WORDS: multiply by 7
EXPRESSION: 7x
EQUATION: 7x = y

18. Describe the rule. Name the rule as an expression
Describe the rule. Name the rule as an expression. Write the equation to represent the function.

19. Describe the rule. Name the rule as an expression
Describe the rule. Name the rule as an expression. Write the equation to represent the function.
ANSWER:
WORDS: divide by 10
EXPRESSION: x ÷ 10
EQUATION: x ÷ 10 = y

20. Describe the rule. Name the rule as an expression
Describe the rule. Name the rule as an expression. Write the equation to represent the function.

21. Describe the rule. Name the rule as an expression
Describe the rule. Name the rule as an expression. Write the equation to represent the function.
ANSWER:
WORDS: multiply by 4 then add 5
EXPRESSION: 4x + 5
EQUATION: 4x + 5 = y

22. Create a table, then graph the equation. y = 5x + 1

23. ANSWER: x 5x + 1 y (x, y) 5(0) + 1 1 (0, 1) 5(1) + 1 6 (1, 6) 2
5(0) + 1 1
(0, 1)
5(1) + 1 6
(1, 6) 2
5(2) + 1 11
(2, 11)

24. The graph shows the total amount, y, that you spend if you buy one book and x magazines. Make a function table for the input-output values. Write an equation from the graph that could be used to find the total amount y if you buy one book and x magazines.

25. ANSWER: 5x + 15 = y x 5x + 15 y (x, y) 1 5(1) + 15 20 (1, 20) 2
5(2) + 15 25
(2, 25) 3
5(3) + 15 30
(3, 30) 4
5(4) + 15 35
(4, 35)

26. BOOKS: The school library is buying new books that cost $9 each
BOOKS: The school library is buying new books that cost $9 each.   Write an equation to find t, the total cost in dollars for any number of books b.

27. ANSWER: 9b = t

28. BOOKS: The school library is buying new books that cost $9 each
BOOKS: The school library is buying new books that cost $9 each. Make a function table to show the relationship between the number of books b and the total cost t.

29. ANSWER: 9b = t b 9b t (x, y) 9(0) (0, 0) 1 9(1) 9 (1, 9) 2 9(2) 18
9(0)
(0, 0) 1
9(1) 9
(1, 9) 2
9(2) 18
(2, 18)

30. BOOKS: The school library is buying new books that cost $9 each
BOOKS: The school library is buying new books that cost $9 each Graph the ordered pairs. Analyze the graph.

31. ANSWER: 9b = t
Sample explanation:

32. QUIZ tomorrow over 8.1 through 8.4