Step-by-step explanation:
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When Loss and Selling price ( SP ) are given , Cost price ( CP ) can be found out using the following formulae :
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We simply derived the formula from Loss = CP - SP. 
First , Swap the sides of the equation :
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Move SP to right hand side and change it's sign :
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This is how , CP can be obtained when we are given loss and SP.
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Answer: −6b+46
Step-by-step explanation:
62 - 6b - 16
−6b+(62−16)
−6b+46
 
        
             
        
        
        
Answer:
3)  5
5)  1
Step-by-step explanation:
substitute the value of 9 for each 'x' in the expression
3) h(9) = 2/3(9) - 1
             = 18/3 - 1
             = 6-1 or 5
substitute the value of 5 for each 'x' in the expression
5) f(5) = -5² + 6(5) - 4
          = -25 + 30 - 4
          = 5-4 or 1
 
        
             
        
        
        
1/5 = 20%
% sponge cakes = 100 - 50 - 20  = 100 - 70  = 30% Answer