Exponents can make the problem smaller and look less confusing. If you see a problem with  5*5*5*5*5*5*5*5 then you're going to eventually loose count and will have to keep repeating. But if you put 5 to the 8th power then you know right away just to multiply 5, (8) times, 
        
             
        
        
        
Complete Question 
 The complete question is shown on the first uploaded image 
Answer:
The  calcium level that is the borderline between low calcium levels and those not considered low is  
Step-by-step explanation:
From the question we are told that 
     The mean is  
      The standard deviation 
     The proportion of the population with low calcium level is   5% = 0.05
5% = 0.05
 
Let X be a X random calcium level
   Now the  P(X < c) = 0.05
Here P denotes probability 
         c is population with calcium level at the borderline 
   Since the calcium level is normally distributed the z-value is  evaluated as 
     
The critical value for 0.05 from the standard normal distribution table is 
        
=>    
substituting values 
        
=>    
=>     
   
 
        
             
        
        
        
Answer:
VERTICAL 
Step-by-step explanation:
  
        
             
        
        
        
Answer:
The two numbers following 1,-2,3,-4,5...  are -6 and 7.
Step-by-step explanation:
index:   1   2   3   4   5 ....
value:    1  -2  3  -4   5
Let the index be n.  Then the first term is a(1), the secon is a(2), and so on.
a(2) = 2*(-1)^(2-1) = 2*(-1) = -2 (correct)
a(3) = 3*(-1)^(3-1)   =  3*(-1)^2 = 3 (correct)
a(4) = 4*(-1)^(4-1)    = 4*(-1)^3 = -4 (correct)
So the general formula for a(n)  is:    a(n)=n(-1)^(n-1)
Thus,
a(5) = 5(-1)^4 = 5
a(6) = 6(-1)^5 = -6
a(7) = 7(-1)^6 = 7
The "next two numbers in the pattern" are -6 and 7.  The first 7 numbers are 
1,-2,3,-4,5, -6, 7