Respuesta :

first u want to subsitute r(x) and c(x) into the last equation. It would look like this: p(x)=12x-5x=20. Then you combine like terms: 12x-5x= 7x. Now it would be simplified to p(x)= 7x+20. The answer would be D.
The answer is D (you just need to plug in the number/variables)
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