Algebra 1 Common Core Student Edition, Grade 8-9

40a. 9 lumens b. Intensity is inversely related to the

square of the distance, so at twice the distance the

intensity is \ as great.

Ch ap t er 12

Get Ready! p. 723

1-2* 6 ' 24 — 50 12 23.^47 4 -5- 5 13Hm 12 6. 3 7. 11 8. 6x — 42

9. 2x + 3 10. - 1 0 + 2x 11. 2. 5 + 2x 12. {1, 2, 3, 5,
   6, 7, 9, 10, 11, 13, 15, 16} 13. {9} 14. {2, 6, 10, 16}


10. {0, 1, 2, 3, 4 , 5, 6 , 7, 8 , 9, 10, 11, 12, 13, 14, 15, 16, 18}


11. Messenger Bag Sales

20 150

i/i

1 100

E

2 50

(^00 50 100)
Price ($)
negative

17. Driving Distances
    and Times

_ C 60

I 40<u

I 20

(^00 10 20 30 40)
Distance (mi)
positive

18. heads or tails 19. into two parts with an equal
    number of data values 2 0. no

Lesson 12-1

Go t It?

1a.

pp. 726-731

-4

b.

‘1 1 '

1.5

.2.5 10.

.-1 6

c. You add or subtract matrices by adding or subtracting

the corresponding elements. If matrices are not the same

size they will not have corresponding elements in each

case.

2a. [6 - 1 4. 2 -10] b.

3. Portland
   Lesso n Ch eck
   -3 9
   0 4
   8 0 10
   -4 2 4

-16.5

0

4.5

-2.25

1.

4.

2 3

2 —3_

-30 0

— 1 2 1 8.

5. 9 6. The student added entries across the rows, but
   the matrices are not the same size so they cannot be
   added.
   Ex e r c i se s
   "-1 1' "2 - 1 "
   o o' 11. 5 - 1 13.
   1

o o

1

2.4

-7.7

15.

19.

-6

-14

— 1 2. 4

—2 7. 9

—3. 1

17.

-19

-47

23. Factory B 25

-23.25

15.5

-14.26

9

-10

27.

-28.2

7.9

30.1

27.9

-36.4

21.

1

2

-20.9

-37

7.8

10.5

30

-1.66

-0.9

0.2

2

0

-7.6

0.3

1.3.

35"

0.

0.6

-1.12

-0.58

0

-0.2

-1.4

29. chicken 31. x= -2 ,y = 5 33. D 35. A 37. 5


30. 0 39. 4


31. 95 __n l i l l l l not likely
    £ 90
    I 85
    ts 80
    A 75

6 7 8 9 1011 12

Shoe Size

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