The revenue from selling x shirts is r(x) = 11x.The cost of buying x shirts is c(x) = 6x + 20.The profit from selling x shirts is p(x) = r(x) – c(x).What is p(x)?MULTIPLE CHOICE: A. p(x) = 17x + 20 B. p(x) = 17x – 20 C. p(x) = 5x + 20 D. p(x) = 5x – 20

The answer is:  [D]:  "p(x) =  5x – 20" .
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Explanation:
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"What is p(x) ? "
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 "p(x) = r(x) – c(x)" 
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   r(x) = 11x ;

   c(x) = 6x + 20 ;

p(x) = 11x – (6x + 20)

       = 11x  – 1(6x + 20)

       = 11x – (1*6x)  +  (-1* 20)

       = 11x – 6x + (-20)
   
       = 11x – 6x – 20

       =  5x – 20 ;

p(x) =  5x – 20 ;  which is:  "Answer choice:  [D]" .
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