For these problems you have to use PEMDAS so for problem 15 you would do the parentheses first, (21-3) you get 18 and then exponents, 3^2, you get 9, no multiplication but there is division so take your answers, 18 and 9 and divide them, you get 2, so the answer to 15 is 2.
        
             
        
        
        
Answer:
p ( x > 2746 ) = p ( z > - 1.4552 ) 
                       = 1 - 0.072806
                       = 0.9272 
This shows that there is > 92% of a republican candidate winning the election hence I will advice Gallup to declare the Republican candidate winner 
Step-by-step explanation:
Given data:
51% of male voters preferred a Republican candidate 
sample size = 5490 
To win the vote one needs ≈ 2746 votes 
In order to advice Gallup appropriately lets consider this as a binomial distribution
n = 5490 
p = 0.51 
q = 1 - 0.51 = 0.49 
Hence  > 5  while
 > 5  while  < 5
  < 5 
we will consider it as a normal distribution 
From the question :
 number of male voters who prefer republican candidate  ( mean ) ( u )
= 0.51 * 5490 = 2799.9 
std =  =
 =  = 37.0399  ---- ( 1 )
 = 37.0399  ---- ( 1 ) 
determine the Z-score = (x - u ) / std  ---- ( 2 )
x = 2746 , u = 2799.9 , std = 37.0399
hence Z - score = - 1.4552 
hence 
p ( x > 2746 ) = p ( z > - 1.4552 ) 
                       = 1 - 0.072806
                       = 0.9272 
This shows that there is > 92% of a republican candidate winning the election hence I will advice Gallup to declare the Republican candidate winner 
 
        
             
        
        
        
Isolate the variable by dividing each side by factors that don’t contain the variable.
X = -2 
Hope this helps!
Have a great day!