Carly is watching television and notices that she has seen the same commercial four times during the same program. she wonders why a company would pay for so many identical advertisements, so it seems she is unfamiliar with the
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Advertising The effectiveness of a television commercial depends on how many times a viewer watches it. After some experiments an advertising agency found that if the effectiveness $E$ is measured on a scale of 0 to $10,$ then $$E(n)=\frac{2}{3} n-\frac{1}{90} n^{2}$$ where $n$ is the number of times a viewer watches a given commercial. For a commercial to have maximum effectiveness, how many times should a viewer watch it?
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