[Solved] Dave's revenue $R on the sale of widgets is determined by the formula R= 35 x-x^2. His cost $C for producing x widgets is given by the formula
Question: Dave's revenue $R on the sale of widgets is determined by the formula \(R=\) \(35 x-x^{2}\). His cost $C for producing \(x\) widgets is given by the formula \(C=5 x+30 .\) For what values of \(x\) is Dave's profit positive?
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