Answer:
1.27 atm. 
Explanation:
The following data were obtained from the question:
Pressure (P) in torr = 968 torr
Pressure (P) in atm =...?
Thus, we can convert from torr to atm by doing the following:
Recall:
760 torr = 1 atm
Therefore, 
968 torr = 968/760 = 1.27 atm
Therefore, 968 torr is equivalent to 1.27 atm. 
 
        
             
        
        
        
Answer:
b. 17,190
Explanation:
Using the formula for C-14 dating,

where Present Value N =1/8 of Parent Sample
Initial Value, 
=1
Half Life, 
=5730 years

=17,190
Therefore the fossil is about 17190 years old.
 
        
             
        
        
        
The answer to your question is frequency. 
If you would like further information about the subject, private message me and id be happy to explain in further detail for you!. :0
        
                    
             
        
        
        
The mass numbers for two isotopes are unequal because they have different numbers of NEUTRONS.
        
                    
             
        
        
        
The answer to this question is B