<span>Answers:
(12x^2 + 3x + 6) + (-7x^2 – 4x – 2) = 5x^2 - x + 4
(2x2 – x) + (-x – 2x2 – 2) = -2x - 2 
(x3 + x2 + 2) +  (x2 – 2 – x3) = 2x^2 
(x2 + x) + (x2 + 8x – 2) = 2x^2 + 9x - 2
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Answer: n-6p^2 + 2np  
Hope this helps!
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
b
Step-by-step explanation:
 
        
                    
             
        
        
        
 Total amount of Carbon-14



=C 
Full marks answer 
 
        
        
        
Answer:
the answer will be 129 i think