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Copyright © by Holt, Rinehart and Winston. Holt Algebra 2All rights reserved.
Name Date Class
LESSON
4-1 Practice AMatrices and Data
Answer the following questions about matrix K.The first one is done for you.
1. How many rows are in the matrix? 3
2. How many columns are in the matrix? 5
3. What are the dimensions (row x column) of K ? 3 � 5
4. Look at the entry where the third row meets the fourth column. What is the entry k 34 ? 2.5
5. Find the entry 3.1 in the matrix. What row is 3.1 in? What column? What is the address of the entry 3.1? Row 2; column 4; k 24
6. What are the dimensions of matrices that can be added to or subtracted from K ?
Only other 3 � 5 matrices
Use the following matrices for Exercises 7–9. Add or subtract, if possible.
A � 3 6
5 0 B �
12 7
5 9 C �
3 6 9
1 5 7
7. A � B A � B � 3 � 12 6 � 7
5 � 5 0 � 9 �
15 13
10 9
8. A � B
�9 �10 �9
Use the following matrices for Exercises 9–10. Evaluate, if possible.
D �
7 0
3 14
4 6
E �
2 4
3 5
6 9
9. 3D 3D � 3 •
7 0
3 14
4 6
�
3 � 7 � 3 � 0 � 3 � 3 � 3 � 14 �
3 � 4 � 3 � 6 � �
21 0
9 42
12 18
10. 2E
4 8 6 10
12 18
K �
1.2 1.5 1.8 0.7 0.4
2.3 0.7 1.3 3.1 4.5
0.1 5.2 4.8 2.5 3.9
A2_IDEA_PA0401.indd 1A2_IDEA_PA0401.indd 1 4/9/06 3:53:47 PM4/9/06 3:53:47 PMProcess BlackProcess Black
Copyright © by Holt, Rinehart and Winston. Holt Algebra 2All rights reserved.
Name Date Class
LESSON
4-1 Practice AMatrices and Data
Answer the following questions about matrix K.The first one is done for you.
1. How many rows are in the matrix? 3
2. How many columns are in the matrix? 5
3. What are the dimensions (row x column) of K ? 3 � 5
4. Look at the entry where the third row meets the fourth column. What is the entry k 34 ? 2.5
5. Find the entry 3.1 in the matrix. What row is 3.1 in? What column? What is the address of the entry 3.1? Row 2; column 4; k 24
6. What are the dimensions of matrices that can be added to or subtracted from K ?
Only other 3 � 5 matrices
Use the following matrices for Exercises 7–9. Add or subtract, if possible.
A � 3 6
5 0 B �
12 7
5 9 C �
3 6 9
1 5 7
7. A � B A � B � 3 � 12 6 � 7
5 � 5 0 � 9 �
15 13
10 9
8. A � B
�9 �10 �9
Use the following matrices for Exercises 9–10. Evaluate, if possible.
D �
7 0
3 14
4 6
E �
2 4
3 5
6 9
9. 3D 3D � 3 •
7 0
3 14
4 6
�
3 � 7 � 3 � 0 � 3 � 3 � 3 � 14 �
3 � 4 � 3 � 6 � �
21 0
9 42
12 18
10. 2E
4 8 6 10
12 18
K �
1.2 1.5 1.8 0.7 0.4
2.3 0.7 1.3 3.1 4.5
0.1 5.2 4.8 2.5 3.9
A2_IDEA_PA0401.indd 1A2_IDEA_PA0401.indd 1 4/9/06 3:53:39 PM4/9/06 3:53:39 PM