Answer:
 The number of students that bring their lunches is 12         
Step-by-step explanation:
Let
x -----> the number of students that bring their lunches
y -----> the total number of students in a class
we know that
The number of students that bring their lunches divided by  the total number of students in a class must be equal to 3/8
 
 
 -----> equation A
  -----> equation A
 -----> equation B
 -----> equation B
substitute the value of y in equation A and solve for x
 
 
 
 
therefore
The number of students that bring their lunches is 12
 
        
             
        
        
        
-14+3/2b-(1+2/8b), then take out the blanket become -14+3/2b-1-2/8b , get 5/4b-15=0 so 5/4b=15 ,get b=15×4÷5. b=12
        
             
        
        
        
Answer:
176.7cm^2
Step-by-step explanation:
Area of circle = π ×r^2
π×15^2
and then divide by 4 because it's one quarter of a circle
 
        
             
        
        
        
Answer:-4/1
Step-by-step explanation:
 
        
                    
             
        
        
        

The Correct choices are :
<u>Question</u> 1 : 
c. commutative property of multiplication
<u>Question</u> 2 :
d. commutative property of addition
<u>Question</u> 3 :
c.  , -0.4, 0.8,
, -0.4, 0.8,  ,
, 