Answer:
It is  or
 or 
Step-by-step explanation: do Keep CHange Flip and then just multiply through to get your answer.
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First, convert 1 kg to g.
1 kg = 1000 g
So 1000 g = 1.28
Set up a proportion:
1000/1.28 = 250/x
Cross multiply:
1000x = 320
Divide 1000 to both sides:
x = 0.32
So 250g costs £0.32
        
             
        
        
        
The answer for this will be 
2a(1-2a ²+3bc)
        
             
        
        
        
Answer:
Step-by-step explanation:
 g/2-9=-7 
inverse operation:
 g/2-9=-7
       +9 +9
 g/2=2 
 g/2=2*2
g = 4