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Notes Over 2.4
Write and label a matrix to organize the following
information.
1. Law Firm Personnel:
Males: 3 Attorneys, 4 Paralegals
Females: 4 Attorneys, 5 Paralegals
Attorneys
Males
Females
3
4
Paralegals
4
5
Notes Over 2.4
Write and label a matrix to organize the following
information.
2. Car Rental Reservations:
Sedans: 26 budget, 47 luxury
Convertibles: 3 budget, 8 luxury
Sport Utility: 5 budget, 9 luxury
Budget Luxury
Sedans
Convertibles
Sport Utility
26
3
5
47
8
9
Notes Over 2.4
3. Find the sum of the matrices.
9 3
0 3

 4 1
6
1
5
4

6 4
Notes Over 2.4
4. Find the difference of the matrices.
4 
 2.5
2
.
5
2
.
5



5 6
3 2 
2 
4
1.5 0
Notes Over 2.5
Rules for Multiplying Negative Numbers.
If there is an even number of negative numbers,
then the answer is Positive.
If there is an odd number of negative numbers,
then the answer is Negative.
1.  23 2.  7 1 3. 10  2
6
7
20
4.  12 0.5 3 5.  4 2 5
18
40
6. 6 62  72
Notes Over 2.5
Simplify the variable expression.
7. 5 w
5w
9.  7  y  y 
7 y
1
10.  6 x 
3
2x
2
11.  4a  a  a 
4a
8. 8 t  t 
2
8t
3
2
3
12.   s 10 s 
15
6s
2
Notes Over 2.5
Evaluate the expression.
13.  15x when x  3
 153
45
14. 2 p  3 p when p  1
2
2 1  3 1
2 3
5
2
Notes Over 2.5
Evaluate the expression.
15.  4m  5m when m  2
2
 4 2  5 2
1610
26
2
16. k when k  3
3
 3
 3 3 3
3
27
Notes Over 2.5
Using Multiplication in Real Life.
17. To promote its grand opening, a record store advertises
compact discs for $10. The store loses $1.50 on each
compact disc it sells. How much money will it lose on its
grand opening sale if it sells 256 discs?
Verbal Number of
Loss per
Total loss

Model discs sold
disc

256  1.50
384
The store loses $384 on its
grand opening.
Notes Over 2.5
Using Multiplication in Real Life.
18. To promote its grand opening, a record store advertises
compact discs for $10. The store loses $1.50
$2.50 on each
compact disc it sells. How much money will it lose on its
grand opening sale if it sells 256
185 discs?
Verbal Number of
Loss per
Total loss

Model discs sold
disc

185  2.50 
462.5
The store loses $462.50 on
its grand opening.