I believe that when finding the radius of a circle you half the diameter, but when finding the circumference of a circle you need to multiply the diameter (14cm) by pi.
So 14xpi= 43.98229715 
But it can be simplified/ rounded to 44cm.
Of course I might be incorrect so do please correct me if I am wrong.
        
             
        
        
        
Answer:
3.92$
Step-by-step explanation:
 
        
                    
             
        
        
        
That is, log x = k if and only if 10 k = x.
 
        
             
        
        
        
              This is a normal distribution with a Mean: 14 g/dL and a Standard deviation: 1 g/dL.
    A ) Hemoglobin levels less than 13:
    13 = 14 - 1 = Mean - 1 SD
    0.16  x 200 = 32
    Answer:  32 people.
    B ) Hemoglobin levels greater than 14 :
     0.50  x 200 = 100
     Answer:  100 people.