Algebra 1 Common Core Student Edition, Grade 8-9

(Marvins-Underground-K-12) #1
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


  1. 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}

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

  3. Messenger Bag Sales


20 150
i/i
1 100
E
2 50

(^00 50 100)
Price ($)
negative



  1. Driving Distances
    and Times


_ C 60
I 40<u
I 20

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



  1. 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.


  1. 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.


  1. 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


  1. 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


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

  2. 0 39. 4

  3. 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

c


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