Complete Question 
A magazine provided results from a poll of 500 adults who were asked to identify their favorite pie. Among the 500 respondents, 12 % chose chocolate pie, and the margin of error was given as plus or minus 5 percentage points.What values do   , n, E, and p represent? If the confidence level is 90%, what is the value of
, n, E, and p represent? If the confidence level is 90%, what is the value of  ?
 ? 
Answer:
a
     is the sample proportion
 is the sample proportion    
 
     is the  sample size is
 is the  sample size is  
     is the  margin of error is
 is the  margin of error is 
     represents the proportion of those that did not chose chocolate pie i.e
 represents the proportion of those that did not chose chocolate pie i.e                        
b
    
Step-by-step explanation:
Here 
      is the sample proportion
 is the sample proportion    
 
     is the  sample size is
 is the  sample size is  
      represents the proportion of those that did not chose chocolate pie i.e
 represents the proportion of those that did not chose chocolate pie i.e  
       
       
       
       is the  margin of error is
 is the  margin of error is 
Generally  is the level of significance and it value is mathematically evaluated as
 is the level of significance and it value is mathematically evaluated as 
      
Where   is the confidence level which is given in this question as
 is the confidence level which is given in this question as  
So  
     
     
 
        
             
        
        
        
Answer:
a = 1.95
Step-by-step explanation:
40a - 61 = 17 
40a - 61 + 61 = 17 + 61
40a = 78
40a / 40 = 78 / 40
a = 1.95
 
        
             
        
        
        
Answer:
A. 22
Step-by-step explanation:
98 - 34 - 42 is equal to 22. Or 34 + 42 os 76. Subtract 76 from 98. You get 22.
 
        
             
        
        
        
If we are to consider the number of slices of bread first,
      number of sandwiches = (28 slices of bread)(1 sandwich/ 2 slices of bread)
      number of sandwiches = 14 sandwiches
If we are to consider the number of slices of cheese
 
      number of sandwiches = (45 slices of cheese)(1 sandwich / 3 slices of cheese)
     number of sandwiches = 15 sandwiches
Since, 14 is smaller than 15 then, 14 is the answer.
<em>Answer: 14 sandwiches</em>