Answer:
25 necklaces
Step-by-step explanation:
each necklace brings $16 profit (20-4=16)
400÷ 16= 25
so, at 25 necklaces, there will be enough profit to break even after paying for the advertising. 
 
        
             
        
        
        
Answer:
1 kilometer for every 10 minutes.
Step-by-step explanation:
Divide 30/3 to get your ratio
 
        
                    
             
        
        
        
Answer: The predicted difference in sleep is 1251437 minutes.
Step-by-step explanation:
Since we have given that 
Number of years of education = 12 years
Number of minutes a week = 2000
As we have 
In case of individual A:
7 days = 2000 minutes
1 year = 365 days = 
12 years = 
In case of individual B:
7 days = 3000 minutes
1 year = 365 days = 
16 years =  minutes
 minutes
So, the predicted difference in sleep between individuals A and B is given by

Hence, the predicted difference in sleep is 1251437 minutes.
 
 
        
             
        
        
        
I don’t see anything. What is the problem.
        
                    
             
        
        
        
24x^2 +25x - 47                     53
----------------------- = -8x -3 - ---------------
ax-2                                     ax-2
add 53/ax-2 to each side
24x^2 +25x - 47+53                     
-----------------------         = -8x -3 
ax-2                                     
24x^2 +25x +6                   
-----------------------         = -8x -3 
ax-2       
multiply each side by ax-2
24x^2 +25x +6   = (ax-2) (-8x-3)
multiply out the right hand side
24x^2 +25x +6  = -8ax^2 +16x-3ax +6
24 = -8a      25 = 16 -3a
a = -3          9 = -3a
                    a = -3
Choice B