Where's X located at on the triangle 
side a
side b
side c
 
        
        
        
Answer:The new cost per person= $19 when there are 12 people 
Step-by-step explanation:
Step 1
Let Number of people be rep as N
 And Cost per person = C
 such that the relationship of  number of people which varies inversely with the cost per person is given as 
 N∝ 1/C
 Introducing constant of proportionality, k, we have that
 N= K/C
 such that when there were 4 people the cost per person was $57, K would be 
 N= K/C
4 = K /57
 k= 57 X 4
k=228
Step 2
Therefore If the number of people changed to 12, cost per person would be 
 N= K/C
12= 228 / C 
C= 228/12
C= 19
The new cost per person= $19 when there are 12 people 
 
        
             
        
        
        
Answer:
1.03
Step-by-step explanation:
Price of phone * 1.03 = Price of phone + Sales tax