Algebra 1 Common Core Student Edition, Grade 8-9

532) 23. Manufacturing A furniture company has two factories. During the first shift,

Factory A made 250 chairs and 145 tables, and Factory B made 300 chairs and

75 tables. During the second shift, Factory A made 275 chairs and 90 tables, and

Factory B made 240 chairs and 120 tables. Which factory made more chairs during

the two shifts? Find your answer using matrices.

24. Sales The weekly sales records below show the numbers of different colors and
    models of shoes sold in two weeks. Which is the color and model shoe with the
    highest sales between February 2 and 15? Find your answer using matrices.

Q Apply

Sh o e Sa l e s , Fe b. 2 - 8 Sh o e Sa l e s , Fe b. 9 - 1 5

Model 73+ J - 1

Bl ack 153 79 Black 172 82

White^241116 White^278130

Bl ue 58 32 Bl ue^6529

Br ow n 95 47 Br ow n^10354

Simplify each expression. [Hint: Multiply before adding or subtracting.)

25. 2

'6 0 -2 — '3 -1 -6 0 3.4 5 - 8 6.4 0

26. 
    
    
    
    • 0.5
      —5 3 1.. 0 4 2. .4.1 - 2 1. 0.2 -2.8 4.2.
    
    
    
    

"4.2 -7.3 0.7 ~ 7.8 -4.1 9.4" ’ -3.7 2.5 -7 .5 _ 8.7 1.5 4.5

27. -3 2.7 -9.3 11.8 - 2 -8 0 0.8 28. 2.2 -6.2 0.3 + (-5 ) -4 0.1 -7.3
    3.6 8.2 —4.8 — L 4 5. 9 3. 3 !. 5 - 3. 1 4.9 5.8 4.1 7.3


28. Think About a Plan Use the table at the right that
    shows nutrition information for 1 serving of each type
    of food. For which item(s) do 6 servings have less than
    1000 Calories?
    
    
    • What matrix represents the nutrition information for
      1 serving?
    
    
    • How can you find the nutrition information for
      6 servings?
    
    
    
    


29. Politics The results of an election for mayor are shown
    below. The town will hold a runoff election between the

FO O D I T EM

X\ O/

Ch i ck en 1 148 29

I

3.5

Fr u i t sal ad 1 221 1 0

j Sp ag h e t t i &

meatballs

127311 13

Source: U.S. Departm ent o f Agriculture

top two candidates if no one received more than 50% of the votes. Should the town

hold a runoff? If so, which candidates should be in the runoff? Explain your reasoning.

Vot es by Precinct

730 Ch ap t er 12 Data Analysis and Probability