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I need help with 20 and 21

I need help with 20 and 21-example-1
User Dyvoker
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2 Answers

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21:
F(x) = 12x- 65.50
User Humber
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For number 20 just see what can be multiplied and get 9 has the answer, but idk 21 sry i tried 
User Litmus
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